Video Files Not Showing Thumbnails in File Explorer

I've ran Disk Cleaner to delete the thumbnails.

I've deleted the thumbnail caches via command prompt (Admin).

I've gone through View/Options/View and made sure "Always show icons, never thumbnails" was not checked.

And still, I cannot get thumbnails for my .mp4 files. All I get is that movie clicker symbol blue icon.

Anything I haven't tried yet?

TIA

Berton said:

I didn't have much of thumbnails for videos until I installed VLC/Video LAN player. Win10 doesn't come with much for videos.

I had thumbnails before my last Windows update. After weeding out several issues, this seems to be the last one I need to deal with.

I already had VLC installed, but went ahead and reinstalled it.

Same issue though. Just an icon. In this case the VLC icon.

I don't know why I had thumbnails for .mp4 files prior to the last Windows update since searching for a fix pretty much agrees with Berton's comment that Win10 doesn't really come with much support for it.

After trying a bunch of tips, I decided to install a program called Icaros.

That allowed me to add .mp4 to the list of filetypes and activate thumbnails for it.

Works. All is good now.