From my POV (sitting at the PC) I am uploading books to the reader, not sideloading.
Sideloading has a negative connotation to me, as if you are supposed to install android apps only directly from Google, or to download books with the reader directly from B&N etc., but you are sidestepping it and doing something wrong.
I am aware of the origins of the term and of some logic to it. But I'm at war with it
