To enable or disable Drag & Drop interface, this is done at the app level within the fields.
To change this:
- Navigate to your Documents app
- Click Toolbox > App Admin
- Click ‘Manage Fields’ from the right nav
- Hover over the File Upload field and click the pencil icon (see below):
- Check or uncheck the box beside ‘enable multiple file upload’ (shown here):
- Click ‘Save’ to complete this change