I don't use Play Books so I don't know if it can sync but I do read on various devices and I've found syncing myself using search is pretty simple. It's also faster than my Kindle can sync automatically, although it isn't as easy.
When I end a reading session I pick a short phrase from near the top of the page and remember it. Then I use text search on the next device to find my place. The phrase for my last session is "He's never been here". Probably if I have to use text search I'll just search for "never been here". A simple short phrase like that will usually be found up to 3 times in the book but text search gives enough context that I can almost always recognize the right one at a glance. And it's not hard to remember a phrase like that.
I often go between my Kindle and Moon+ reader. Syncing between Moon+ reader on 2 devices is faster than I can type the phrase. Typing is, though, is faster than 2 of my Kindles can synch themselves.
Barry
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