Teams Live Events: Adding shared screen content to queue not possible?

Loren We noticed the same problem today while doing a test run for a webinar tomorrow! Last week, we held a Teams Live Event where we had three presenters plus myself as a producer, and the presenters were all able to share presentations into the share tray at the bottom of the screen, where I could pick them and insert them into the live event queue.

Today, however, the only option the presenters had was to share their screen - like in a regular Teams meeting - which overrides any content that the producer has set up. Something has obviously changed within the past six days, since last Tuesday everything worked fine. If anyone has any idea what has happened, please let me know! Our next event is coming up in 24 hours and now it turns out that we apparently can't run it like the previous ones.