I have been using a 5 year old Samsung Galaxy Tab 10.1, the original, for a long time, and I've accumulated a huge pile of books, many of which I converted from my epub collection. On that version of Android, I could just hook my tablet to my PC and drag the .mobi files into the /kindle folder and voila, the books would appear in my kindle app when I opened it again. I just upgraded my tablet finally to a Pixel C, and I was hoping to do the same thing, but it seems that I have to add the books one by one. I tried dragging them into the /kindle folder, but even on restarting the app, the books didn't appear. Am I going to have to add them one by one by using the "send to Kindle" option? Thanks!