Photos migrate

I have a copy of a site that I online. (Type Events
Online)
Everything works for users, the events.
For photos, I copied their names from the old folder (data)
of the new (data) module files.
Exported my tables (bx_photos_main, bx_events_main, bx_events_images ...)
But the photos do not appear.
However, if I add a new, it appears that's ok.

I wonder if "hash" of the table bx_photos_main is the problem.
Or a story index.

How to do better now?

Thank you very much for helping me