I'm new to Dreamweaver and I have no idea how to code, but I managed to make an HTML newsletter. But the issue now is, whenever I send it via Gmail, my pictures are shown as alt_text.

The images are on the same folder as the newsletter.html file.
What am I doing wrong?
Here's the document and images for download if anyone needs it:
https://drive.google.com/file/d/0B6idya0YoPGnekc5V28tRGljWDQ/view
<!doctype html>
<html>
    <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>EmailTemplate-Responsive</title>
    <style type="text/css">
html,  body {
    margin: 0 !important;
    padding: 0 !important;
    height: 100% !important;
    width: 100% !important;
}
* {
    -ms-text-size-adjust: 100%;
    -webkit-text-size-adjust: 100%;
}
.ExternalClass {
    width: 100%;
}
div[style*="margin: 16px 0"] {
    margin: 0 !important;
}
table,  td {
    mso-table-lspace: 0pt !important;
    mso-table-rspace: 0pt !important;
}
table {
    border-spacing: 0 !important;
    border-collapse: collapse !important;
    table-layout: fixed !important;
    margin: 0 auto !important;
}
table table table {
    table-layout: auto;
}
img {
    -ms-interpolation-mode: bicubic;
}
.yshortcuts a {
    border-bottom: none !important;
}
a[x-apple-data-detectors] {
    color: inherit !important;
}
</style>
    <style type="text/css">
        .button-td,
        .button-a {
            transition: all 100ms ease-in;
        }
        .button-td:hover,
        .button-a:hover {
            background: #555555 !important;
            border-color: #555555 !important;
        }
        @media screen and (max-width: 600px) {
            .email-container {
                width: 100% !important;
            }
            .fluid,
            .fluid-centered {
                max-width: 100% !important;
                height: auto !important;
                margin-left: auto !important;
                margin-right: auto !important;
            }
            .fluid-centered {
                margin-left: auto !important;
                margin-right: auto !important;
            }
            .stack-column,
            .stack-column-center {
                display: block !important;
                width: 100% !important;
                max-width: 100% !important;
                direction: ltr !important;
            }
            /* And center justify these ones. */
            .stack-column-center {
                text-align: center !important;
            }
            .center-on-narrow {
                text-align: center !important;
                display: block !important;
                margin-left: auto !important;
                margin-right: auto !important;
                float: none !important;
            }
            table.center-on-narrow {
                display: inline-block !important;
            }
        }
    </style>
    </head>
    <body bgcolor="#e0e0e0" width="100%" style="margin: 0;" yahoo="yahoo">
    <table bgcolor="#e0e0e0" cellpadding="0" cellspacing="0" border="0" height="100%" width="100%" style="border-collapse:collapse;">
      <tr>
        <td><center style="width: 100%;">
            <div style="display:none;font-size:1px;line-height:1px;max-height:0px;max-width:0px;opacity:0;overflow:hidden;mso-hide:all;font-family: sans-serif;"> (Optional) This text will appear in the inbox preview, but not the email body. </div>
            <!-- Visually Hidden Preheader Text : END --> 
            <!-- Email Header : BEGIN -->
            <table align="center" width="600" class="email-container">
            <tr>
                <td style="padding: 20px 0; text-align: center"><a href="http://www.avex.lv/"><img src="Headers.png" width="600" height="150" alt="" border="0"></a></td>
              </tr>
          </table>
            <table cellspacing="0" cellpadding="0" border="0" align="center" bgcolor="#ffffff" width="600" class="email-container">
            <tr> </tr>
            <tr>
                <td background="SJCAM-Logo.png" bgcolor="#222222" valign="middle" style="text-align: center; background-position: center center !important; background-size: cover !important;"><!--[if gte mso 9]>
                    <v:rect xmlns:v="urn:schemas-microsoft-com:vml" fill="true" stroke="false" style="width:600px;height:175px; background-position: center center !important;">
                    <v:fill type="tile" src="assets/Responsive/Image_600x230.png" color="#222222" />
                    <v:textbox inset="0,0,0,0">
                    <![endif]-->
                <div>
                    <table align="center" border="0" cellpadding="0" cellspacing="0" width="100%">
                    <tr>
                        <td valign="middle" style="text-align: center; padding: 40px; font-family: sans-serif; font-size: 15px; mso-height-rule: exactly; line-height: 20px; color: #ffffff;">                                                                                                                                                                                                                                                                                                                                                                                                           </td>
                      </tr>
                  </table>
                  </div>
                <!--[if gte mso 9]>
                    </v:textbox>
                    </v:rect>
                    <![endif]--></td>
              </tr>
            <tr>
                <td align="center" valign="top" style="padding: 10px;"><table cellspacing="0" cellpadding="0" border="0" width="100%">
                    <tr>
                    <td class="stack-column-center"><table cellspacing="0" cellpadding="0" border="0">
                        <tr>
                        <td style="padding: 10px; text-align: center"><a href="http://www.avex.lv/catalogsearch/result/?q=M20"><img src="M20.png" width="270" height="270" alt="alt_text" border="0" class="fluid"></a></td>
                      </tr>
                        <tr>
                        <td style="font-family: sans-serif; font-size: 15px; mso-height-rule: exactly; line-height: 20px; color: #555555; padding: 0 10px 10px; text-align: left;" class="center-on-narrow">16MP<br>
                          4K@24fps<br>
2K@30fp<br>
1080P@60fps<br>
Sony IMX206 sensor <br>
NTK96660 Novatek CPU <br>
Gyro Anti-shake & WiFi </td>
                      </tr>
                      </table></td>
                    <td class="stack-column-center"><table cellspacing="0" cellpadding="0" border="0">
                        <tr>
                        <td style="padding: 10px; text-align: center"><a href="http://www.avex.lv/catalogsearch/result/?q=Sj6+legend+air"><img src="SJ6LegendAir.png" width="270" height="270" alt="alt_text" border="0" class="fluid"></a></td>
                      </tr>
                        <tr>
                        <td style="font-family: sans-serif; font-size: 15px; mso-height-rule: exactly; line-height: 20px; color: #555555; padding: 0 10px 10px; text-align: left;" class="center-on-narrow">14MP<br>
                          4K@24fps <br>
                          2K@30fp <br>
                          1080P@60fps <br>
                          Panasonic MN34112PA sensor <br>
SJCAM A9s CPU <br>
Gyro Anti-shake & WiFi<br></td>
                      </tr>
                      </table></td>
                  </tr>
                  </table></td>
              </tr>
              <tr>
                <td align="center" valign="top" style="padding: 10px;"><table cellspacing="0" cellpadding="0" border="0" width="100%">
                    <tr>
                    <td class="stack-column-center"><table cellspacing="0" cellpadding="0" border="0">
                        <tr>
                        <td style="padding: 10px; text-align: center"><a href="http://www.avex.lv/catalogsearch/result/?q=Sj6+legend"><img src="SJ6Legend.png" width="270" height="270" alt="alt_text" border="0" class="fluid"></a></td>
                      </tr>
                        <tr>
                        <td style="font-family: sans-serif; font-size: 15px; mso-height-rule: exactly; line-height: 20px; color: #555555; padding: 0 10px 10px; text-align: left;" class="center-on-narrow">16MP <br>
                          4K@24fps <br>
                          2K@30fp <br>
                          1080P@60fps <br>
                          Panasonic MN34120PA sensor<br>
                          NTK96660 Novatek CPU <br>
                          Gyro Anti-shake & WiFi</td>
                      </tr>
                      </table></td>
                    <td class="stack-column-center"><table cellspacing="0" cellpadding="0" border="0">
                        <tr>
                        <td style="padding: 10px; text-align: center"><a href="http://www.avex.lv/catalogsearch/result/?q=Sj7+Star"><img src="SJ7Star.png" width="270" height="270" alt="alt_text" border="0" class="fluid"></a></td>
                      </tr>
                        <tr>
                        <td style="font-family: sans-serif; font-size: 15px; mso-height-rule: exactly; line-height: 20px; color: #555555; padding: 0 10px 10px; text-align: left;" class="center-on-narrow">16MP <br>
                          4K@30fps <br>
                          2K@60/30fp <br>
                          1080P@120/60fps <br>
                          Sony IMX117 sensor<br>
                          Ambarella A12S75 CPU<br>
                          Gyro Anti-shake & WiFi</td>
                      </tr>
                      </table></td>
                  </tr>
                  </table></td>
              </tr>
            <tr>
                <td align="center" valign="top" style="padding: 10px;"><table cellspacing="0" cellpadding="0" border="0" width="100%">
                    <tr>
                    <td width="33.33%" class="stack-column-center"><table cellspacing="0" cellpadding="0" border="0">
                        <tr>
                        <td style="padding: 10px; text-align: center"><a href="http://www.avex.lv/catalogsearch/result/?q=SJBAT"><img src="Battery.png" width="170" height="170" alt="alt_text" border="0" class="fluid"></a></td>
                      </tr>
                        <tr>
                        <td style="font-family: sans-serif; font-size: 15px; mso-height-rule: exactly; line-height: 20px; color: #555555; padding: 0 10px 10px; text-align: left;" class="center-on-narrow">1000mAh high capacity substitutive Li-ion battery is the best choice for keeping your action camera away from powering off. For SJ6 Legend and S7 Star.<br>
                          <br></td>
                      </tr>
                      </table></td>
                    <td width="33.33%" class="stack-column-center"><table cellspacing="0" cellpadding="0" border="0">
                        <tr>
                        <td style="padding: 10px; text-align: center"><a href="http://www.avex.lv/catalogsearch/result/?q=Dual-Slot"><img src="DualBatteryCharger2.png" width="170" height="170" alt="alt_text" border="0" class="fluid"></a></td>
                      </tr>
                        <tr>
                        <td style="font-family: sans-serif; font-size: 15px; mso-height-rule: exactly; line-height: 20px; color: #555555; padding: 0 10px 10px; text-align: left;" class="center-on-narrow">2-slot battery charger for SCJAM SJ6 Legend or SJ7 Star.<br>
                          <br>
                          <br>
                          <br>
                          <br>
                          <br></td>
                      </tr>
                      </table></td>
                    <td width="33.33%" class="stack-column-center"><table cellspacing="0" cellpadding="0" border="0">
                        <tr>
                        <td style="padding: 10px; text-align: center"><a href="http://www.avex.lv/sjcam-external-microphone-for-sj6-legend-sj7-star"><img src="EXTERNAL-MIC.png" width="170" height="170" alt="alt_text" border="0" class="fluid"></a></td>
                      </tr>
                        <tr>
                        <td style="font-family: sans-serif; font-size: 15px; mso-height-rule: exactly; line-height: 20px; color: #555555; padding: 0 10px 10px; text-align: left;" class="center-on-narrow"> External Microphone for SJ6 Legend, SJ7 Star and SJ360<br>
                          <br>
                          <br>
                          <br>
                          <br>
                          <br></td>
                      </tr>
                      </table></td>
                  </tr>
                  </table></td>
              </tr>
            <tr>
                <td dir="ltr" align="center" valign="top" width="100%" style="padding: 10px;"><table align="center" border="0" cellpadding="0" cellspacing="0" width="100%">
                    <tr>
                    <td width="33.33%" class="stack-column-center"><table align="center" border="0" cellpadding="0" cellspacing="0" width="100%">
                        <tr>
                        <td dir="ltr" valign="top" style="padding: 0 10px;"><a href="http://www.avex.lv/sjcam-smart-remote-wrist-watch-m20-sj6-legend-sj7-star"><img src="RemoteWatch.png"  width="170" alt="alt_text" border="0" class="center-on-narrow"></a></td>
                      </tr>
                      </table></td>
                    <td width="66.66%" class="stack-column-center"><table align="center" border="0" cellpadding="0" cellspacing="0" width="100%">
                        <tr>
                        <td dir="ltr" valign="top" style="font-family: sans-serif; font-size: 15px; mso-height-rule: exactly; line-height: 20px; color: #555555; padding: 10px; text-align: left;" class="center-on-narrow"><font color="#111111"><strong>Smart Remote WristWatch</strong></font><br>
                          <br>
                          Smart Remote Wristwatch, features include: Power, Video-Photo, WiFi on/off, Burst mode, Waterproof up to 3 meters.<br>
                           <br>
                            <table cellspacing="0" cellpadding="0" border="0" class="center-on-narrow" style="float:left;">
                            <tr> </tr>
                          </table>
                         </td>
                      </tr>
                      </table></td>
                  </tr>
                  </table></td>
              </tr>
            <tr>
                <td dir="rtl" align="center" valign="top" width="100%" style="padding: 10px;"><table align="center" border="0" cellpadding="0" cellspacing="0" width="100%">
                    <tr>
                    <td width="33.33%" class="stack-column-center"><table align="center" border="0" cellpadding="0" cellspacing="0" width="100%">
                        <tr>
                        <td dir="ltr" valign="top" style="padding: 0 10px;"><a href="http://www.avex.lv/sjcam-remote-controller-selfie-stick-m20-sj6-legend-sj7-star"><img src="Selfiestick.png" width="170" alt="alt_text" border="0" class="center-on-narrow"></a></td>
                      </tr>
                      </table></td>
                    <td width="66.66%" class="stack-column-center"><table align="center" border="0" cellpadding="0" cellspacing="0" width="100%">
                        <tr>
                        <td dir="ltr" valign="top" style="font-family: sans-serif; font-size: 15px; mso-height-rule: exactly; line-height: 20px; color: #555555; padding: 10px; text-align: left;" class="center-on-narrow"><font color="#111111"><strong><br>
                          Remote Controller Selfie Stick</strong></font> <br>
                          <br>
                          Smart Remote Controller features include: Power, Video-Photo, WiFi on/off, Burst mode, Waterproof up to 3 meters.<br>
                          Folded Length (mm): 280 ; Extended Length (mm):900<br>
                          <br>
                            <table><br>
                          </table>
                         </td>
                      </tr>
                      </table></td>
                  </tr>
                  </table></td>
              </tr>
          </table>
            <table align="center" width="600" class="email-container">
            <tr>
                <td style="padding: 40px 10px;width: 100%;font-size: 12px; font-family: sans-serif; mso-height-rule: exactly; line-height:18px; text-align: center; color: #888888;"><webversion style="color:#cccccc; text-decoration:underline; font-weight: bold;">View as a Web Page</webversion>
                  <br>
                  <br>
SIA AVEX<br>
Katlakalna iela 9,Rīga<br>
3. Stāvs<br>
<br>
<br><unsubscribe style="color:#888888; text-decoration:underline;">unsubscribe</unsubscribe></td>
              </tr>
          </table>
          </center></td>
      </tr>
    </table>
</body>
</html>
