Pat I guess it works with multiple attachments in Desktop but sometimes for Mobile I dont get the popup with few attachments so I am not sure what are the rules. Maybe the attachment image size also matter - let me try add small 4 attachments

Pat just added comment and tagged Jewel to your original post - you can try with Mobile how it works but I am pretty sure that this is the same case since we test it now with Desktop here. So far this is what I have experienced - Mobile view has the same issue with 1 attachment (but dont have issue with 4 and probably even 2 aka multiple attachments). Of course you could add first 4 dummy attachments and then remove 3 and then you will get the popup/modal view.