Creating bookmarks on mobile app

I can't for the life of me find how to create a bookmark on the Android or iOS mobile apps. I've found some forums dating back 7 years suggesting it's possible but has something changed with the latest v6 revision? I'm currently running 6.0.1.39873 on my server.

I can create a bookmark on the Windows app easily enough, and can view/playback that bookmark on the mobile app, but I can't find any way of tapping on the timeline to then add a bookmark.