As far as I know personal documents service hasn't been updated for some time, and it will reduce your KF8 to mobi 7.
I don't think that should lose the cover, but then I never send KF8 files to pdoc service. Instead I side-load them (usually with dropbox, google drive etc.). I plan to keep doing that until they update the service to support KF8. I don't care so much about syncing as I'm generally only reading on one device.
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