Can't download/access pdf articles on my other devices

I have a Zotero account that I have been operating on my MacBook Pro. Now I want to access all my articles on my iPad and iPhone, and I can’t. When I click on a pdf file, I get an Error message that reads: The attached file is not available in the online library. Please check that the file has synced on the device where it was added.
I have upgraded my storage to unlimited, so I don’t understand why.
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