(a) I just received an OTA Release 15.0.13 on my Pixel 3XL. So, that part is solved. (b) For the Update channel being greyed out on Linux Fedora 31, I reverted to my tried and true Debian Buster (10) build which allows me to invoke the Preview Update channel. So, all good on my primary PC now. (c) Yes, I am a home | private user. Cursed by too many years in the IT industry, now retired, I tend to overthink things and lucky for me I had installed **Third Party Product** on two of my critical remote PCs - which came in absolutely handy when I was unable to reach them via TeamViewer. (d) The only remaining issue is the Preview build, Release 15.x, for my remote Raspberry Pi 4B which is still at 14.x - which is not an issue but would be nice for consistency across my PCs.
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