Timed pdf-saves to a cloud folder like Dropbox is useful, as it permits sharing an always up-to-date url-link of the lecture notes.

Unfortunately, the timed-saves feature is extremely fragile. Many actions will permanently break the timed-save-link between the document and the pdf. By this I mean that timed save is reset (to no save) next time document is opened. Remaking the timed-save will also no longer work. Only work-around is making a new empty document and copy-past all slides over, then create a timed-save.

Actions that I have discovered break the link are 1) changing name of parent folder 2) saving a restored document over the original document. But I suspect more actions break the link.