- Search two files on the sourcewiki (wikimedia commons) that are not on the target wiki – for example 3389 Dean Forest Railway.jpg and 08473 Dean Forest Railway
- Visit Special:ImportFile on the target wiki (mwfileimport.wmflabs.org)
- Submit the one file
- Click EditTitle
- Add the name of the other file
→ You will get the error message The title you are currently trying to import to already exists on the source wiki. – this is not listed in T189570.