Please consider adding a prompt or alert asking to either keep or update credits and attributions.
Maybe add a succession of "steps" to the Image options 1) Link/Upload 2) "Next" button, to: Image Options Display, 3) "Next" button, to: Properties (existing text remains) Save.
Remove option deletes image and text.
Many times, I'm adjusting the shape or size of the same image in another program and need to upload an updated version, it totally wipes out this text forcing me to rewrite or I’ve learned to keep a text document to copy and paste those items back in...
Of course, I realize it's best to input alt text/credits at the "end"or sometimes I think I've got it this time, its final, but it's still not quite right, or needs to be changed upon multiple reviews.
(Note I am posting multiple single subject ideas as suggested based on my experience in working in this application 🙂