That's fine, but then I don't know what the storage folder is doing on your WebDAV server. The dates are from March, so it's possible you were using a custom location pointing at your cloud storage folder back then or you just made a backup of your data directory on there. You can check the date of the zotero.sqlite file in the parent folder of 'storage' on your WebDAV server to see when the database is from. If that's a backup, that's fine, but otherwise you should delete that whole folder containing zotero.sqlite on your WebDAV server to avoid future confusion.
In any case, you don't appear have your active data directory in cloud storage, so we can go back to the other issue.
We can't help you with browsing files on your WebDAV server, sorry — that's obviously something you'd have to know how to do. The above folder is your local data directory. Don't touch that.
Let's stick to the original issue — this is too confusing.
If you have questions about your data directory, please start a new thread, but again, you're showing a screenshot of your active local data directory. There's no problem with that. The problem was just that you also apparently have a copy of your data directory on your WebDAV server for some reason.
You can try tapping back to the libraries view and going to settings -> Local Storage -> Delete All Attachment Files, and then trying to download that file again.
Also, do you remember whether you uploaded that missing attachment from iOS (iPhone or iPad) or web or desktop Zotero client?
I see in your previous logs that you have some pending uploads and internal issues on the iOS app, but it looks like your WebDAV server was having issues before, so that may be the cause.
That attachment was previously captured from the web and then saved to the Zotero client, and it can be opened without any issues in the Zotero client.
Desktop，I consulted with the Nut Cloud customer service and followed their instructions. The result showed that the WebDAV settings are fine, so the issue should be with Zotero.
Upgrade Storage
https://s3.amazonaws.com/zotero.org/images/forums/u13101021/wj71rzgo3cmj6zigilww.png
Could you please teach me how to do it? Thank you very much!
In any case, you don't appear have your active data directory in cloud storage, so we can go back to the other issue.
https://s3.amazonaws.com/zotero.org/images/forums/u13101021/4frjfljhfzbvdykat64e.png
I reloaded this file in the Developer Tools, but still couldn't find it.
https://s3.amazonaws.com/zotero.org/images/forums/u13101021/9b2cidd9x5k8otpkgskl.png
Where can I open my WebDAV server? This image shows the Zotero-related folder. I was worried about Zotero running out of memory before, so I did some operations to increase the memory, but I have forgotten what I did.
https://s3.amazonaws.com/zotero.org/images/forums/u13101021/uop9jmpyci40pxdp3zfi.png
https://s3.amazonaws.com/zotero.org/images/forums/u13101021/9vsizv53gmcnihp5pwdr.png
If you have questions about your data directory, please start a new thread, but again, you're showing a screenshot of your active local data directory. There's no problem with that. The problem was just that you also apparently have a copy of your data directory on your WebDAV server for some reason.
https://s3.amazonaws.com/zotero.org/images/forums/u13101021/ewp2s4kot339otsxe976.png
I found it！
And no, there is no remote control by the Zotero staff. They will ask for a Report ID or a Debug ID when necessary.
https://s3.amazonaws.com/zotero.org/images/forums/u13101021/9w2qnz06xttfg5mtq1lk.jpg
What was happening before was a bug, but this is just the expected message if the file doesn't exist. See Files Not Syncing.
I see in your previous logs that you have some pending uploads and internal issues on the iOS app, but it looks like your WebDAV server was having issues before, so that may be the cause.