Hi @MichaelShouse , I feel your pain!
If you open your map in Map Viewer (not Classic), select your layer and go to 'Configure pop-ups', turn 'Show as list' off.
Then in your Dashboard, for the Details element, turn 'Attachments' on (rather than 'Media').
A frustrating change that I have had to make on several Dashboards...
Hope this helps!
Did you have any luck with this? One thing that may be worth trying is to create a new feature with the same schema and append your data to that. See if that changes your pop-up/attachment options in Map Viewer. Not ideal...
I had to 'fix' a Dashboard today and the attachment options in the pop-ups menu wasn't available in Map Viewer and I (somehow) resolved this by opening the map in Map Viewer Classic, turning on the 'Show feature attachments as links' option in the pop-up setting, saving the map, then opening it up in Map Viewer again, and the attachment setting were there!