Subfolder can filter out sub-folders, but won't affect files at the top-level.
Subfolder also does not work with Synchronize, as mentioned in the guide I linked: How to filter items by location or sub-folder
Subfolder can filter out sub-folders, but won't affect files at the top-level.
Subfolder also does not work with Synchronize, as mentioned in the guide I linked: How to filter items by location or sub-folder