zotero storage
I uploaded a film, which took a lot of my zotero storage. I then deleted it from my library. Instead of synchronizing and so delete the film in the zotero cloud, zotero indicates that synchronization is impossible because i have reached my quota.
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BionatsciCheck if the film is still in your Zotero trash folder (at the botom of your collections list) - if it is right click on the trash folder to empty it.