I believe that when I changed computers, Macbooks, my attachments are not syncing between computers. Even though I have paid for unlimited storage on Zotero. I have in preferences (on both computers) "File Syncing' checked (both boxes); and "sync attachment files in My Library using "Zotero". It would seem that some of my attachments carried over to the new computer - mainly the ones that were added after I signed up for unlimited storage.

How can I get my attachments to copy over to my new macbook through syncing? Bear in mind this is the whole reason to pay for unlimited storage.