Using this feature, you can now automatically migrate Salesforce Attachment or files to Amazon S3. To configure this feature, refer to the Configuration for Migrate Attachment to S3
PS: View Drag, Drop & Upload Files to Amazon S3, a Salesforce AppExchange app for moving files from Salesforce to Amazon S3: https://appexchange.salesforce.com/appxListingDetail?listingId=a0N3000000B5ZPqEAN