I side load with send to kindle. Right from calibre in the book folders. I like having it all in the cloud basically so I can pull it on my kindles whenever I want or need it. I have covers though on my docs, but it does say personal docs on my PW. I can't recall off hand now what it says on my basic kindle.
My main thing is having it all in one place. And I rarely plug in my kindles through USB. I think only times I do it is when I manually update them.
But its whatever one prefers.
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