You can view the Release Notes from the following link: https://docs.google.com/document/d/1XFCfZvExhKI_l7avhBgtio9L_WxkZ63GEoomJrDxDdM/edit#heading=h.8ddmcktt655z
PS: View Mass File Migrate Salesforce file migration app on Salesforce AppExchange:
https://appexchange.salesforce.com/appxListingDetail?listingId=e9874a66-2001-4e3d-8a29-3a2ed7f584c4