Lightroom mobile fails to export

I used an ipadpro (2024) for travel. I backed up my daily photos into the ipad, and then imported those photos into the latest Lightroom mobile version. 

In between, to test it, when i had a round 2000 photos, i exported the originals, and it worked ok.

Now i am at 3500 photos left, and some videos (they were not there first time). When i try to export (as originals) the export starts, the rendering completes, and then i get a nice "export dialog" in the top right which is blank. And flashes every few seconds. 

Seems to me that this is "too much" for Lightroom mobile. So it's a joke in terms of stability, as a few thousand pics are normal these days for a wildlife photographer ( i took 10.000 pictures and culled already, but wanted to do more culling in the office ). 

I also noticed that when the ipad goes to "sleep" during the proces, the export option never shows up either. 

I will redo all the culling, but this seems to be a serious limitation.

Frank