ipad webdav synced issue

Computer A, computer B and Ipad are successfully synced from same WebDAV server and PDFs can be smoothly downloaded in computer A and computer B except iPad.

The prompt showed up from iPad is belowed

the attached file is not available on the webdav server.please check that the file has synced on the device where it was added.

interestingly, some PDFs are available but some aren't.


Debug ID: D207033836

please save me.

Thank you so much
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