Attachment macro not adding label when Drag&Drop files

Issue Summary

Labels are not added to attachments when using the Attachment macro Drag&Drop option.

Steps to Reproduce

1. On a page add an Attachment macro with Attachment labels configured > Save
2. Drag&drop the image into the attachments macro

Expected Results

Uploading attachments by Drag&Drop should apply those labels to the uploaded attachments. Same behavior as it already does for clicking the "browse for files" link on the macro.

Actual Results

The image was uploaded to the page without any label set, hence, not yet showing on the page because the macro is configured to show images that only have the label set.

Workaround

1. Go to the page > More > Attachments
2. Click and add label for the desired attachment

Once back on the page, the list is going to show the attachment.