What is the format of the 'My Clippings.txt' file? The reason I am asking is because I use Google Play Books most of the time. All highlights in Google Play Books is stored in Google Docs under "Highlights _Book_Name_" and I am wondering if readwise works for those.
Unfortunately 'My Clippings.txt' is a narrowly (and honestly, pretty awfully) defined format that Kindle devices generate. So that won't work for Google Play Books.
That being said, we want to build a separate Google Play Books importing tool -- it's on our roadmap!
