Check manually whether field values of a few items are accurately migrated.
NOTE: You need to refactor any frontend widgets that used the old fields and now need to use the new Related data and Related media fields.
After you have verified that the new fields contain the accurate migrated data, you can go to the structure of the dynamic module type and delete the old field. This deletes all old records and drops the old field table (in case you used Guid Array and media mappings).
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