How can I avoid duplicate songs when transferring a playlist again?

Before repeating a transfer, inspect the destination playlist and the previous transfer result. If your version allows choosing an existing or new destination playlist, confirm that choice and review the selected songs. Do not assume every route automatically removes duplicates. For a changed source list, identify the additions first rather than blindly repeating the full transfer.

Steps to follow

1. Inspect the existing destination playlist and note whether the first transfer already created all or part of the list.
2. Decide whether you need a separate copy or only the source's new additions, using the options your version offers.
3. Review the selected tracks before retrying, then compare the result with the destination's previous contents.

Do not assume a transfer is synchronization

Repeating an import is not necessarily an incremental update. If your available route does not expose duplicate handling, inspect and clean the destination before another full transfer. Keep the original list until you have checked which copy should remain in use.