Hi @ludwig_van ,
In the Create file action for Folder Path use the below expression. If you create multiple files on the same day , it will save the files to a same folder(meaning it won't create duplicate folders if folders with the same name exist already in that Folder Path).
/@{formatDateTime(utcNow(),'yyyy')}/@{formatDateTime(utcNow(),'MMMM')}/@{formatDateTime(utcNow(),'dd')}
Adding a screenshot for your reference. It works the same way for OneDrive/SP.
Flow
Folder Structure wit Files
Hope this helps , if this answers your question please give this answer a thumbs up and mark this as a solution.
Thanks,
Sanmesh