Add "info" style to upload button + add help text when the dropzone is hidden.

src/Umbraco.Web.UI.Client/src/views/common/overlays/mediaPicker/mediapicker.html

@@ -28,6 +28,7 @@
                             label-key="general_upload"
                             action="upload()"
                             disabled="lockedFolder"
+                            button-style="info"
                             ng-if="acceptedMediatypes.length > 0">
                 </umb-button>
             </div>

src/Umbraco.Web.UI.Client/src/views/components/upload/umb-file-dropzone.html

@@ -37,6 +37,12 @@
         </div>
     </div>
 
+    <div ng-show="hideDropzone" ngf-drag-over-class="hide" class="text-center">
+        <small>
+            <localize key="media_dragFilesHereToUpload">You can drag files here to upload</localize>
+        </small>
+    </div>
+
     <!-- List of uploading/uploaded files  -->
     <ul class="file-list" ng-show="done.length > 0 || queue.length > 0 || rejected.length > 0 || filesHolder.length > 0">