Lost the option to not upload attached files
Somewhere along in the upgrade process, the option to stop uploading attached files while retaining them in the desktop database was removed. Now I can only upload everything or delete them from my database. This effectively breaks the program for synching for free users.
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Upgrade Storage
I believe the file sync option is turned on by default, so if you re-installed Zotero or used in on a new computer that would have enabled it. It's also certainly possible that you never had enough files to get over the sync quota before, so you just didn't notice it. It may also be that if you use ZotFile to link to files it only moves attached files, not top-level PDFs (so that the latter would have stayed&synced with Zotero). What is highly unlikely is that Zotero would just change a prefence by itself.