Sync with iPad not possible anymore

Hi
I would add papers to my zotero library on my computer, but then read them from my iPad. It worked all fine, up until now. For the recently added papers I get the error message: "The attachd file is not available in the online library. Please check that the file has synced on the device where it was added.". I don't know how to find out, what the issue is, or how I can fix it.
Thank you for any help!
Kind regards
Nicole
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