I first ran into this problem today with the town square channel on our local server, but I’ve reproduced the problem with the demo server as follows:
- Using desktop browser: create account on demo.mattermost.com, login, start Development demo, and post a test message in the private Development channel. All good.
- Uninstall Android Mattermost app and install latest (says last updated 12/16/19).
- Using app, sign in to demo.mattermost.com server. Town Square channel displays fine.
- At some point the Development demo ended and I got a notification from the app. Clicking the notification should have taken me to the Development channel but it just hung on a white screen.