Hi there @perezdavid1990 - sorry to hear you're having issues with this.
It sounds like you're using a shared folder which takes up space on all of the members of the share.
If that's the case, you can ask your collaborator to open up a file request for you from their end. In that way, you'll be able to upload back to their account without affecting your own account's storage.
I hope this helps and please keep me posted!