Thumbnails preview cannot be seen in folders

Hi everyone,I Have the same problem " I am new here. I am using sketchup pro 2020 in microsoft windows 10 Pro system. The thumbnail preview of the skp files cannot be seen in the folder for a while. Is there anyone who can help me out? Thanks in advance" with SketchUp 2022 and Windows

I have this problem with the .skp files – .skb files do show a preview however.

A repair as administrator did not solve this.