One thing I noticed recently: When I highlight in the Android app, then open the highlighted file in Chrome later on, the highlighted text is not 'copied' into the annotations pane consistently. Sometimes, no text appears in the annotation list at all (just a note that there's a highlight). Sometimes, the text is garbled and cut off. If I delete the highlight and then re-highlight the same text within Chrome, it copies correctly to the annotation frame.
I will post if this behavior continues. I noticed it in one or two files so far.