SHARESCREENING

I have been successfully sharing a movie on screen with group participants for quite a while, until a week ago.  What happened is the following:  I was able to share the movie while still small on the page, but when I clicked to full page, the participants couldn't get it.  Instead of the green bar (as host) appearing, indicating I am sharing a screen, I got an orange bar.  The participants sharing the screen then lost the sound and picture.

One way I got around it was to name one of the participants as co-host, who clicked onto zoom sharing and then could go into full screen.

Any way I could restore the original way to share a movie onto the screen?

Thanks for any suggestions.

Warren