Before we had team spaces, we used work spaces to organise documents into contexts.
After establishing separate team spaces per former work space, it is now much easier to configure permissions for a given set of documents.
This situation has led to some documents still living in the original work space within a personal space, with new document being created in the team space.
This brings the need to move documents between spaces, here from a personal space to a team space. Currently, this is not possible.
A workaround is to download the SQLite database of a document as a .grist file and to reimport it into the desired team space. Unfortunately this will also change its URL, which is more relevant when it had been published publicly before.