Change Poster Frame in Lightroom (cloud-based)

[TAPGANG]

Does anyone know how to change/set a poster frame for videos in Lightroom? Can't seem to find any tutorials for the cloud-based Lightroom version in Windows 11. 

[Henry5CEA]

I'm looking for this, too. Is there an easy way to change the thumbnail (or poster frame) for videos in Lightroom CC? Many of my videos have black images as the thumbnail / poster frame.

[Henry5CEA]

Sorry to be replying to my own message, but might someone be able to suggest ANY way to do this? It occurred to me that it wouldn't be so bad to export all of my videos from cloud-based Lightroom, import them into Lightroom Classic (for which I've seen instructions regarding changing the poster frame), export them back out of Lighroom Classo to then finally re-import them into cloud-based Lightroom. (I'm dealing with a few hundred videos.) However, this plan was thwarted because upon exporting the videos I see that they have all lost their date / time information and have a creation date based upon the export process. 

There must be a way to do this, right?