I opened Tap Forms today after not using it for about a month and noticed that all the photos have disappeared from my forms on the iPad. The photos were originally added on the iPad, but later deleted from the Photo app. In the past I had tried placing photos in Tap Forms and them deleting them from Photos to make sure they remained in the database, and they did. I also use Tap Forms on my Mac, and the photos appear on their Mac counterparts. After a sync, some of the photos reappeared, and some did not.
Can you check to make sure that you have sync enabled on your iPad? It may be that it was turned off at some point and that’s why the photos are not showing.
Sorry I took so long to reply to this — I never got an email that there was a comment! Anyway, yes, syncing is definitely turned on. And some photos synced and some did not!
I have the same problem where some photos do not show on an iPhone but do on other synced devices.