Short movie green thumbnail in Library View Lightroom Classic

[Lyrinda]

I have imported cellphone images to my Classic Lightroom Version 6.12.  Many of the images are green 2-second .MOV

movie thumbnails.  When I open them they have a 2-second video display progress bar at the bottom of the image.  When I click the Play triangle it "plays" but nothing changes - no image is visible.  Please note that not all of the .MOV thumbnails are green.  Some of them have visible still thumbnail images. 

Can anyone explain?  I presume that I inadvertently had the "Live View" button pushed on my iPhone 11.  (I never intentionally use that Live View feature.) Note that when I open the Develop window the following notice appears:  "Video is not supported in Develop."

Is there any was to see an image in Lightroom?

I am presuming that I have to edit the Live View movies on the cellphone so that they become a single JPG and then reimport them.  Please confirm or advise.

Expanded view in LibraryThumbnail view in LibraryNotice in Develop View

[Lyrinda]

Please note that not all of the .MOV thumbnails are green.  Some of them have visible still thumbnail images.  Can anyone explain?