Delaying item drop states in a Drag & Drop interaction

I am having a similar issue with my delayed drag and drop states.

• When I use the player’s submit trigger it works perfectly, but I would like a more intuitive customized submit button.
• When I deactivate the 'Delay item drop states until interaction is submitted' check box the drop states work. But I would like to delay feedback.
• The Problem: When I use a customized submit button the drop states are not triggered, but the interaction is.

In other files I have made this work correctly with text boxes. In this one I used images. In order to make the images “tile” with desired spacing I grouped them with blank frames (boxes). I wondered if this grouping caused the problem. But why does it work with the player submit trigger? If the grouping is the problem can you suggest a way to cushion the images with desired spacing? I attached the file. Love the sharing and learning in this community.