One option might be a storage migration.
https://learn.microsoft.com/en-us/windows-server/storage/storage-migration-service/migrate-data
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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Whats the best way to move shared folders to another domain and keep permissions?
One option might be a storage migration.
https://learn.microsoft.com/en-us/windows-server/storage/storage-migration-service/migrate-data
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
Because the old domain trusts the new domain, the shared folders simply needed permissions set to user groups in the new domain. Then the folders could be moved to the new domain without any loss of functionality.