So, I attempted this & failed miserably. I sideloaded Alkido which opens fine, then selected the Adobe ePub edition of a book from Overdrive. It gave me a BookTitle.ascm to download-- weird, but I downloaded it to my PC anyways, emailed it to myself, & used ES File Explorer to put it in the Library folder. Went into Alkido, into the Library folder-- it didn't see anything. Went to the Overdrive site on my Fire, tried to download the book, the link just took me to a page with characters (& I do still have 'allow apps from unknown sources' checked, just in case).
Any idea what I'm missing here?