A photo says it cannot be deleted — what does that mean?

This message is the app being careful, not broken. Every photo has a record — where its file lives, which section it belongs to, its capture details. Deleting uses that record to remove exactly the right file and nothing else. If the record is incomplete, the app refuses to guess: a destructive action against a broken record is how the wrong thing gets removed, so the delete is blocked on purpose.

What it means for you

• Nothing else is affected. Other photos in the section delete normally (deleting photos), capture carries on, and reports still generate — the stuck photo simply stays put until its record is repaired.
• The photo itself is almost certainly fine. An incomplete record is a bookkeeping problem, not a damaged image.
• You cannot fix it from the app, and that is deliberate — the repair has to happen against the record itself.

What to do

Ask us through the support page, and include:

1. The project and plot names, and which section the photo is in.
2. Whether you are on iPhone or Android.
3. Anything you remember about the photo — roughly when it was taken, or whether it arrived by import rather than capture.

We repair the record from our side, and after that the photo behaves normally — keep it or delete it as you intended. If the same message appears on several photos at once, say so in your message: a pattern points us at the cause much faster than a single case.