Saving an entity box through its AJAX form will not store the image files unless they were uploaded

If you save an entity box that has image fields through its admin interface at /admin/content/entity_boxes/entity_boxes/[ID]/edit without manually uploading each image, the chosen files will still get saved. This doesn't happen when you are submitting it from the AJAX box edit form.

I've come up with a JS work-around based on this that automatically triggers the upload button when the input field is changed. This temporarily resolves this problem and I'll post it as a patch.