iOS app crashes on papers with handwritten notes

There are actually two bugs I encountered, of which the one in the title is critical.

Some of the papers with previously added handwritten annotations crash the whole app when I try to open them. Tried to delete them from the device and re-download, but it is not helping. It is very frustrating, since iOS app is my main reading tool, and is critical for my work.

Second bug being that some of the highlights are not synced with the web version.

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Thank you for letting us know. It would help us a lot if you could email the PDFs in question to This will let us reproduce the problem and figure out where the crash is happening.

Sorry for the delay. Sent the PDFs just now.

@jason Didn’t want to open a new topic for this, since it seems related. I have a 555 pages book, annotated with highlights and probably some handwritten notes too. Now I can’t open it neither on the web, nor in iOS app. It just hangs on loading annotations. But I was able to open it and annotate before obviously.

Edit: web app opened the book after 20min of loading. iOS didn’t even after 60min, so I closed it.

Thank you for letting us know. At the moment, we are unfortunately not optimized for books with many annotations.

Your 555 pages book with annotations seems challenging both for the web and mobile. Any chance you can share the PDF with us so we can try ourselves (email ? At least on iOS it should open in reasonable time.

Hi, I sent the email. Tried to open it again, and it is still not able to do it.

Thanks! I will share with @andreas (web) and @carlos (iOS) and see what they find.

It seems the initial syncing of the annotations get stuck. After all are synced to our servers the first time ti seems to work well at least on the web. We are looking into that.