I know there is some proper ordering of steps that successfully involves all of these things, but (very frustratingly so) my

, Reddit, and MobileReads searches have not come to fruition.
Essentially, I have my own personal collection of ePubs I've managed with Calibre, Nooks, & some other FOSS software. I've since made the switch to the Kindle ecosystem in the last week, and my
dream scenario would be able to get these books (converted into *.mobi or *.AZW3 or whatever else I need) into my Kindle Cloud, show up as Books and not Personal Documents, AND have them show the book covers on both my new Voyage and Kindle app on my Android cell phone.
So far I've been able to get my books into the cloud, Whispersync between devices does work, but my covers don't show up on my Voyage despite showing up on my Android app.
Thanks in advance everyone.