[Zubersoft]

You can't use the sync library feature to merge annotations at the moment. It will overwrite the annotations on one device with the annotations from the other device. There is no way around this. There are no options for merging annotations in MobileSheets right now - this is one of the limitations of the current book mode implementation. My recommendation is if you have annotations you need to push from one device to the other, have one device embed the annotations in the annotations editor, then sync with the option to prompt the user for decision, and you can choose to keep the annotations on the first device, but use the file from the second device. That will effectively merge the annotations. I do plan to make this all easier once I have time to update the book mode feature to automatically push across annotations from one device to the other.

Mike