I've tested last night sending epub book with .epub extension (so no renaming / changing extension , since it is no longer necessary) via e-mail (using Calibre to send e-mail using my Gmail account) and that worked.
"change the extension" trick definitely used to work for past couple of years. Both when using e-mail and when using official "Send to Kindle" apps. I've only use that method when I didn't have access to a computer with Calibre installed so I've then used Android phone + Kindle for Android app (that integrates a "Send to Kindle" option in Android's Share menu) .
Does it work at the moment can't tell you since I didn't test that in last 2-3 months.
I personally don't use "Personal Documents Archive" / wireless sending of books to my Kindle at all. The only time I've used it in the past is when I had to send some books to a relative that is an older person that lives in different city and she doesn't even own a computer.
I prefer to use Calibre + USB cable and transfer either azw3 (+ apnx for page numbers) or KFX files.
As for book covers: I meant and asked you about the "book cover as screensaver" functionality. Do you or don't you have that option to enable/disable that? In Settings> Device Options. If you have it enabled (remotely by Amazon servers!) it will appear as a fist / top option called "Book covers"... if the fist option is "Device info" then you still don't have it enabled. Just like I no longer have it and I had it before upgrading firmware from 5.14.0.1 to 5.14.1.1 and then doing the jailbreak.
I'm annoyed but not having that option... the PDOC cover thumbnails is not a relevant thing for me since I don't have that problem because I transfer my books via USB cable & with Calibre and those are not marked as PDOC and Calibre generates and transfers cover thumbnail image so Kindle firmware uses it and all is well and nice looking.
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