change 'Save to Files' icon from upload to folder, thx @jviereck for the feedback

js/mail.js

@@ -494,7 +494,7 @@ var Mail = {
 							attachmentId + '"] ' + saveToFilesBtnSelector;
 					}
 					$(saveToFilesBtnSelector)
-						.removeClass('icon-upload')
+						.removeClass('icon-folder')
 						.addClass('icon-loading-small')
 						.prop('disabled', true);
 
@@ -531,7 +531,7 @@ var Mail = {
 								// Remove loading feedback again
 								$('.attachment-save-to-cloud')
 									.removeClass('icon-loading-small')
-									.addClass('icon-upload')
+									.addClass('icon-folder')
 									.prop('disabled', false);
 							}
 						});
@@ -676,7 +676,7 @@ var Mail = {
 
 				$('textarea').autosize({append: '"\n\n"'});
 			};
-			
+
 			var loadDraftSuccess = function(data) {
 				self.openComposer(data);
 			};

templates/index.php

@@ -118,7 +118,7 @@ script('mail', 'jquery-visibility');
 					<img class="attachment-icon" src="{{attachment.mimeUrl}}" />
 					{{attachment.fileName}} <span class="attachment-size">({{humanFileSize attachment.size}})</span><br/>
 					<a class="button icon-download attachment-download" href="{{attachment.downloadUrl}}"><?php p($l->t('Download attachment')); ?></a>
-					<button class="icon-upload attachment-save-to-cloud"><?php p($l->t('Save to Files')); ?></button>
+					<button class="icon-folder attachment-save-to-cloud"><?php p($l->t('Save to Files')); ?></button>
 				</li>
 			</ul>
 			{{/if}}
@@ -127,14 +127,14 @@ script('mail', 'jquery-visibility');
 				{{#each attachments}}
 				<li class="mail-message-attachment" data-message-id="{{messageId}}" data-attachment-id="{{id}}" data-attachment-mime="{{mime}}">
 					<a class="button icon-download attachment-download" href="{{downloadUrl}}" title="<?php p($l->t('Download attachment')); ?>"></a>
-					<button class="icon-upload attachment-save-to-cloud" title="<?php p($l->t('Save to Files')); ?>"></button>
+					<button class="icon-folder attachment-save-to-cloud" title="<?php p($l->t('Save to Files')); ?>"></button>
 					<img class="attachment-icon" src="{{mimeUrl}}" />
 					{{fileName}} <span class="attachment-size">({{humanFileSize size}})</span>
 				</li>
 				{{/each}}
 			</ul>
 			<p>
-				<button data-message-id="{{id}}" class="icon-upload attachments-save-to-cloud"><?php p($l->t('Save all to Files')); ?></button>
+				<button data-message-id="{{id}}" class="icon-folder attachments-save-to-cloud"><?php p($l->t('Save all to Files')); ?></button>
 			</p>
 			{{/if}}
 		</div>