Android cannot download some PDF attachments via WebDAV

I use Zotero Desktop on Windows and the official Zotero Android app.
My attachment files are synced via WebDAV (Jianguoyun/Nutstore).

Some PDF attachments can be downloaded normally on Android, while others show a “?” icon. When I tap one of these attachments, it briefly shows a download/progress icon and then changes to “!”.

The affected PDF opens normally in Zotero Desktop.

I reproduced the failed download on Android with Debug Output Logging enabled.

Debug ID: D99629545

Could you please check the debug log and tell me why the Android app cannot download this attachment?
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