I've just synced my zotero library with my university computer where i don't have a lot of memory space. Thus I changed the settings to not synchronize attachet files at all.

It would be great if Zotero would ask me wheather I want to download the file that I'm about to open (but is not on my machine, because it was never synced) instead of telling me that the file was not found and could be moved or deleted.

So I would like to have a "download files only on request" option, and a "download file" and "remove local copy" context menu entry. As soon as it is downloaded it should be synced as always.