Storage Quota Error

On the up/right corner of Zotero I have a yellow icon that says

"You have reached your Zotero File Storage quota. Some files were not uploaded. Other Zotero data will continue to sync to the server. See your account settings for additional storage options.
j.html (840 KB)"

But my current plan is unlimited storage.

How can I fix this?
Does it cause problems with my sync to the clouds?
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