Yes, the Glowlight 4 Plus will not connect as a USB drive. It is extremely frustrating. Calibre can see it but not access it in Windows, but it is my understanding that a Mac running Calibre can access it.
I had Windows 10 when I first got the GL4+ but now I have Windows 11. When I connect the GL4+ it shows up as a drive under "This PC" in file explorer called "BNRV1300". Under that drive is a folder called "Nook". I just copy books to that Nook folder using file explorer and they seem to work just fine.
It is very aggravating but overall I like my GL4+. I love having buttons on both sides and the screen is very crisp and clear. Good luck and I hope that helps.
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