Welcome to the #dominoforever Product Ideas Forum! The place where you can submit product ideas and enhancement request. We encourage you to participate by voting on, commenting on, and creating new ideas. All new ideas will be evaluated by HCL Product Management & Engineering teams, and the next steps will be communicated. While not all submitted ideas will be executed upon, community feedback will play a key role in influencing which ideas are and when they will be implemented.
I think the responsibility to provide this kind of sync functionality would be for the 3rd party application.
Only the provider of the application that contains the photos would know which document, which field, and in which format the photo is stored in.
So I'm sorry but I have to reject this idea.