Indexing page number (image viewer)
I have seen many record volumes that are ordered or grouped incorrectly (e.g. two books merged). Consequently, the image groups inherit these problems.
I suggest that page numbering indexing (when available) may be submitted by the users and later validated by machine or human verification.
In the future, this can help reorganize the image volume pages as they were recorded originally. It will also be relevant to track if there are missing pages.