zotero cannot sync all my library into the zotero storage service

I subscribed zotero unlimited storage service. I noticed that not all my library attachments, about several GB , are synced into the online storage. only about 500MB is online. Zotero did not give me any error message. the sync sign only rotated for a few seconds and then stopped after I clicked it.
Hope someone can help
Sign In or Register to comment.