I suggest posting this question in the FM Go forum as well as doing a bit of research there on photo taking and emailing PDF's. Both have been discussed there quite a bit.
I will suggest that for associating multiple pictures with your audit record, the best method is to use a related table with one picture per table. a text field in that table can serve for a caption if you wish.
Correction, this is an FMP12/Filemaker Go project (no FMP11).
ANd cross-posted as suggested.