I thought I had seen this posted before but I cannot find it anywhere.
We have users that attach a few images and submit. They forget a few and open the survey as Edit and Resend. At this point they can edit any text but it will not let them add any more photos at all or change any. In this form there is no repeats at all. There are about 10 individual photo questions.
I also just tested a form with 1 text and 1 photo field and I cannot edit the attachment at all on an edit.
Thanks for any info
I have also come across this issue and it seems that there is no work around other than adding a repeat to your survey and adding new photos to new records in the repeat section of a sent survey.
Your problem is due to the way the info is stored. The attribute data is stored in a table that allows edits while the attachments are stored differently.
Hope this helps.
It may have been this thread:
Adding Images/Attachments to Survey in INBOX
Blog post on working with images in more detaiL: