No not let LF support know of this issue yet. My gut feel is that it’s something to do with the OS, in my case I have experienced this problem on iPhone and iPadOS.
When I use the OS files app and browse to my network connected WD drive, I can see the files but they do not have thumbnails either, so maybe LF uses the same Apple methods for browsing and displaying the files hence a lack of thumbnail. I have noticed that when browsing using the files app, although there is no thumbnail, when you select it, the app appears to “fetch” a copy of it and then shows the image along with other info.
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Thanks for the offer but I’m managing with my workflow at the moment but it would be good to get the issue resolved.
UPDATE: Just emailed support with reference to this thread.