I try to get filepath of image and it works:
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if (resultCode == Activity.RESULT_OK && requestCode == REQUEST_CODE){
            val image = data!!.data
            val projection: Array<out String> = arrayOf(MediaStore.Images.Media.DATA)
            val cursor = context!!.contentResolver.query(selectedImage, projection, null, null, null)
            var filepath = ""
            if(cursor!!.moveToFirst()){
                val columnIndex = cursor.getColumnIndex(projection[0])
                filepath = cursor.getString(columnIndex)
            }
But MediaStore.Images.Media.DATA is deprecated. How should I get filepath in proper way? I need to make File object to upload it on server.