Provide settings to let users choose the sync frequency
I suggest to provide a setting where GoodNotes sync's only rarely.
So, for instance, when I go back to the overview of all the notes I have in GoodNotes on my iPad, or when there is a longer time of inactivity in GoodNotes, or when I switch to a different app, then GN could do a sync.
Right now, it synchronizes every 10 seconds or so, which drains the battery a lot. (All apps with heavy Wifi activity do that.) But I don't need to go back and forth between Mac and iPad while taking notes. I just occasionally bring up my notes on my Mac when I need to look something up (which is very convenient, btw).
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Colin Baciocco commented
I highly support this idea - some of my larger notebooks have a lot of images in them, which means my iPad is constantly pushing a lot of data (and getting pretty hot / draining the battery) when working with them