My friends are unable to use the manuscript option how it is meant to be. They can create a manuscript, but none of them are able to edit or view the manuscript in anyway. However, I can. I'm the one who purchased the Grandmaster tier, and I'm the original owner of the campaign.
They can create manuscripts, but when clicked on the ones they make (or the one I make) it just shows blank besides the title.
Manuscripts are not accessible by anyone apart from the owner of the world. The bug here is the fact that they can create a manuscript not that they cannot access it. The capability for people to write manuscripts on other people's worlds is something that we are discussion for the next version but it would be mostly for editing and commenting that writing.