Switch speaker output

The students are asking me to share a video but they hear nothing. Switch the speaker output to the room speaker system so everyone in the classroom can hear the shared clip, then confirm audio levels at a safe volume and tell me if anything will loop back into the mic.

Before I give this to faculty, make speaker output switching safer: surface the current output device name, offer an obvious toggle to the room speakers, show a quick volume preview that plays a test tone at recommended classroom level, and warn about potential audio feedback with live mics.

I started screen sharing a video but the students in the room can't hear it. I don't know whether the call is sending audio to my laptop speakers or the room sound system. I also worry switching could cause feedback with the lectern mic. What checks and the safest sequence will get audio into the room without causing a feedback loop?

Each time I play media I waste time switching audio to the room speakers and risk feedback. This interrupts lessons and annoys students. What routine, default setting, or quick check before sharing media will make audio land in the right speakers every time?