Configuring imports - Smart.XChange
You can use the area Import settings to determine the procedure for folders which have already been imported.

If you check the box next to Forbid repeated import of already successfully imported file you prevent the same file from being imported again and used for synchronisation. Each file can only be imported and used for synchronisation once if this box is marked.
Checking the box next to Delete successfully imported files deletes the successfully imported files again and does not use them for synchronisation either.