Hello,
Thanks for reaching out and for your interest in CryptPad!
Sadly you can't force team members to save documents to the team drive. The closest thing you can do, as a user, is to enable automatic pad storage in CryptDrive to limit data loss due to not saving a newly created document. Afterward, the person will be able to move the document to another place if necessary. At least it will be saved.
Don't hesitate to better describe your company workflow and explain your needs!
Best regards,