Only a small part of my video files can display thumbnails, but they can all be displayed normally in the Windows 11 Explorer. How should I set it up to make DO display thumbnails normally?
Do all thumbnails for the same files/folder display in File Explorer?
Does it work in Opus if you copy the same files to another location that isn't under cloud storage?
Video thumbnails come from Windows (potentially via the cloud storage provider/server in the case of things like OneDrive folders), and Opus isn't that involved in their creation, so it's strange if they work in one place but not the other, unless something is blocking Opus from opening some of the files or the cloud storage API is doing wrong in some way.
It's also possible that the OS is getting stuck when thumbnailing one of the files, which is then delaying the others from appearing. Help > Task Manager can show what the thumbnail threads are doing. (If you don't have the menu item, get it from Settings > Customize > Default Toolbars.)
After I copied them to a non-OneDrive path, the thumbnails did appear. May I ask what caused this? All the videos in the screenshots I took have been downloaded locally.
I'm having a similar problem. The thumbnails seem to only populate for Office Suite programs and PDF's. Screenshots and videos are not populated. I did what you suggested and copied a screenshot from my One Drive to my desktop and it should up perfectly. I also noticed in Opus (13.19.3 beta) the only way to see thumbnails is by changing the view from Details to Details + Thumbnails. But of course that's not the best way view ALL documents that are contained in the same folder. When the view is "Details", you can hover over items and see the thumbnails. I attached a video to demonstrate. However, when I clicked "upload" to add the video for Opus, Windows Explorer opened and the thumbnails looked the same. I attached that video as well. It's just weird LOL!
Let me tell you all my final solution.
After I used the built-in disk cleanup tool of the system to clean up the thumbnail option on the C drive, all the video thumbnails were loaded when I opened the videos again.