Situation: one iPad 4 users with their Zoho accounts working on a shared document

Problem: when a user has edited a document with Writer on the iPad, another cannot edit the shared document  on the iPad because Writer tells me : another use has logged in in Writer, please login with your Zoho Docs account and try again. When I logout and login again no success!

I cannot see any connected apps on other users.

My conclusion: when using the mobile ios apps for Writer/Docs with several users you cannot switch between users with different Zoho accounts with  the Writer app.

I cannot see a way to logout Writer, like you can with Docs

Kind regards,

John