FYI, I access my videos via “Local Drives” icon. Then there is an attached USB external hard drive and also network shares (“nfs” and “cifs”). There are about three parent/root folders in total. 1 = USB drive; 2 = “nfs” network share; 3 = “cifs” network share.
When I click on “Local Drives” Icon, it shows the folders for the USB drive and network shares but I don’t see my custom thumbnails for these particular parent/root folders. But when I click on any of these folders, I do see the thumbnails for all the subfolders.
For each parent/root folder, I have a .jpg file located in the root directory of each folder named after the same name as the parent/root folder. For example, my USB hard drive’s name is called “Videos1” and the .jpg file is called “Videos1.jpg” and is located at the root of the drive. The same goes for my network shares; their corresponding .jpg files are in the root directory of the shared folder with the same name. For instance, the “nfs” network share folder is called “Videos2” and a “Videos2.jpg” file is in the root directory of this network share.
I also tried changing the jpg files to “folder.jpg.”