Thank you for the update. I’m noticing different behaviors between my personal OneDrive and my OneDrive for Business accounts. In personal OneDrive (see screenshot, to the left), thumbnails display even for cloud-only image files. However, it takes significantly longer (minutes) compared to Windows Explorer (which displays the same thumbnails within seconds).
In OneDrive for Business (screenshot, to the right), no thumbnails are shown, and all file icons have the ominous cardboard box overlay. Clicking an image icon downloads the image and shows a preview, but the thumbnail only appears after refreshing the current Lister with F5.
It seems that my company enforces a policy in OneDrive for Business that somehow prevents automatic thumbnail downloads for cloud files. The policy aims to prevent employees from downloading large numbers of files for offline access, but has the unintended side effect of blocking thumbnail previews.
If I view the same OneDrive for Business folder (bottom right) in FastStone Image Viewer, the program downloads all images in the folder in the background, showing all thumbnails after a short delay.
It would be useful if Directory Opus could also offer an option to download all currently displayed image files to generate thumbnails. Is there a way to do this? Pressing F5 doesn’t do it.