pp animation and manual slide show not working

I attempted to share my PP on a live zoom screen share. 

I found out later that the audience only saw my 1st slide but I had been manually forwarding them on my end with no problem.
When I don't use full screen mode, I can't use the animations in my PP,, which messes up my presentation by me not being able to slowly reveal the PP content.

How can I fix this ASAP?

Thanks,
Janis