Sync with iPad not possible anymore

Hi
188BET靠谱吗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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