Keynote closes out when I stop share on Zoom

When in a Zoom meeting, I use Keynote (instead of PowerPoint) on my Mac. All is fine until after I click "stop share". When I click "start share" and it asks me to choose the window I want to share, my Keynote file has been closed out. I then have to go find it on my desktop, again. When I click the Keynote file to reopen, it's back in presentation mode but attendees can't see it. So, I have to exit presentation mode, click "start share", choose file, and click play mode... all while speaking. I thought it was a glitch, but others have shared that this isn't happening to them. Help!