Understanding the Zotero storage

I have a Zotero account and I use windows desktop version of Zotero in several computers.
I recently received a request to renew my 2 GB subscription. The storage tab says my current usage is ~370 mb. As far as I know I don't store none of my pdfs/files in zotero, just the metadata is in Zotero and it is linked to files existing in my computers.
How do I check what does the ~370 mb usage stands for?
Which data is stored on Zotero?
Could the ~370 mb just be metadata ?
  • No, metadata doesn't count against your storage quota.
    As far as I know I don't store none of my pdfs/files in zotero, just the metadata is in Zotero and it is linked to files existing in my computers.
    You have stored files. Click in the middle pane, press + to expand all items, and look for attachments without a chain icon.

    You can use ZotFile to convert those to linked files if you want to.
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