Loss of ability to select photograph for background

Mac Pro (late '13 black trashcan, Intel Xeon E5) running Monterey 12.6.1 and Zoom 5.12.9 (13190)

Have used/enjooyed Zoom without incident for years. Until a few months ago I was able to select a photo on my Mac and use it as my background picture on Zoom; recently that ended (can't tell if that was Mac OS or Zoom update). Is that option no longer available?  If it is still available, is there a summary of the current process to use it on a Mac?

Thanks in advance.