I've been using scribd mostly for audiobooks, and mostly on my iphone 6p. The selection of books and audio is great! However, the ios app is VERY flawed! Bookmarks disappear and are changed, it doesn't always remember where it is (for audiobooks) even on the SAME device, much less synced to another device. Further, at least for some books, the chapter that the software thinks you're on is not the same as the chapter announced orally by the reader. Tech support is courteous, but somewhat slow, and more important, seems incapable of dealing with these issues. Once there was a wait of several months before an upgrade came out that was supposed to fix problems, but it did not.
Downloads in the ios version are sometimes troublesome (the queue stalls, and can't be re-ordered, at least I can't figure out how).
I've had a little experience using the android version of the app on a kindle fire. Its somewhat better, though I'm not sure yet how much.
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