Hi Peter 

Thanks for posting in the community! After a folder has been shared with you anyone that is going to need to create new documents (or transfer documents) within the folder will have to have permissions as an "owner" of that folder.  Whoever created the folder will have the ability to change this permission from editor to "owner". If you've been granted this access (within your Documents Page) you can add your files to the shared folder by dragging and dropping them onto the shared folder. Please let me know if you have further questions.

Hi. Could it be that the option 'owner' is gone?
I have only the options; "Can edit and share" "Can edit" "Can comment" and " Can view".
We need a team folder where my co-workers places there (new) documents.

Hi Johannes

Thanks for reaching out on the community and good question. "Can edit and share" will give your co-workers the permission to add their files to the shared folder. Hope this helps!