Hi leyakoreya ,
Thanks for your post.
You can already attach files from ATUM attachments on the edit product page.
You also can decide to attach them to WC outgoing emails.
However, they won't appear in Stock Central, sorry. If you need it, some custom development would be required.
FYI, I don't know if that would meet your needs, but ATUM Multi-Inventory allows you to attach files to the distinct inventories, and such files are shown and can be edited FROM Stock Central.
Best Regards,
José Andrés