Yes, you can migrate already migrated files/attachments. Follow these steps:

  • Navigate to the Mass File Migrate app and select the "Mass File Migrate" tab.
  • In the "Select File/Attachment" dropdown, choose a file or attachment according to your requirement.
  • Select the object from which you want to migrate files/attachments.
  • Turn ON the Toggle "Reconsider already migrated Files"
  • Click on the "Search" button.

With this setting, already migrated files/attachments will also show in the table, and you can migrate them again as needed.


PS: View Mass File Migrate Salesforce file migration app on Salesforce AppExchange:

https://appexchange.salesforce.com/appxListingDetail?listingId=e9874a66-2001-4e3d-8a29-3a2ed7f584c4