AttachmentExtractor v.2017.21 and newer support redirecting the SharePoint access to a different server.
All Attachments moved to Sharepoint are saved as a link in Dynamics CRM. If you are moving to a new Sharepoint, AE can redirect the Sharepoint access for its AccessOnDemand-plugins to a different server.
To enable this behavior, you need to manually create a setting for the AttachmentExtractor product as described here (Link)
Value: A pipe (|) separated pair of strings defining the original Sharepoint location and the replacement one.
If required, multiple redirects can be defined, separated by semicolons (;)
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