Unable to Export to Video Slideshow with .MOV files

[Firislander]

Hello. I am using Lightroom 5.7 on an iMac. I an unable to Export to Video a slideshow with 2 JPEGS and 3 .MOV files. I've previewed the slideshow and it plays but when I attempt to Export it to Video (without creating a Saved Slideshow) the progress bar at the top of the screen shows a tiny section of the a white bar but it never moves further. I have been able to Export to Video a spearate slideshow containing one .MOV file just fine. When I tried to Export to Video just one of the 3 .MOV files in my slideshow the same thing happened as when I tried to Export all three .MOV files and the 2 JPEG files...the progress bar shows just a tiny bit of a white bar and then never moves further.

I just can't figure this out and I'm hoping that someone here will be able to help me.

Thank you for any help.

{Moved from Lightroom Cloud to Lightroom Classic Forum by Moderator}

[jalter]

I have the same issue. Put 3 video clips together as a slideshow of 14 seconds in length. When I try to export as a movie, I get a progress bar but nothing happens. On a Macbook Pro with OS 10.15.7 with LR2021.