- Get some file eligible for transfer to Commons (say from English Wikipedia)
- Export it
- a. View the preview on Commons
- b. Notice the tool detected {{Copy to Commons}} template and removed it, since it's not needed there
- c. Mark the checkbox [ Mark source wiki file as imported to Wikimedia Commons ]
- Back to English Wikipedia.
- Notice the tool adds {{Now Commons}} templates on your behalf
- Notice the tool does not remove the {{Copy to Commons}} template which is also no longer needed
- Notice you have to manually remove it or leave it as some somebody else's problem. Both are not great
Once a file has been successfully moved to Commons, the {{Copy to Commons}} template is no longer valid. And attempt to move the file again will lead to error. So since the tool can already detect and remove it on Commons, it'll be good to also remove it from the source Wiki.