@BobC: Could you try validating the .kepub.epub file in Sigil? The errors might show why the Glo rejected the file. There will be one error for the property the extended driver adds to the cover in the OPF. You could also try saving from Sigil and then copying that manually to the Glo.
The reason for this is that I don't believe the device reads the full file, only the OPF and NCX files. If these have an error, that could cause the file to be rejected.
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