I used to be able to annotate the pdf documents I downloaded to zotero with preview (highlights, etc.). When I closed the pdf, the changes would be saved automatically. Now every time, when I close the pdf file, a window pops up telling me that I can't save those edits in zotero, and where I would like to save the pdf document. This is very inconvenient. I think this problem might be due to the new mac OS sierra. Is there anyway, I can change the preferences in zotero, to allow me to save annotations again? Any help would be much appreciated.