Cannot Download Newly Uploaded Books

[cryptaliagy]

Describe the bug/problem

For the last while, I have been unable to download any newly-updated books. The existing books are still working, and the newly uploaded books can be found in the file system, but the download doesn't work. See the logs below:

[2025-03-23 20:51:36,899] ERROR {cps.helper:533} Rename title from /tmp/calibre_web/309750a2ec07f326002ea7b701266508 to /books/Unknown/Microsoft Word - Assignment Description.docx (463) failed with error, trying to move without metadata
[2025-03-23 20:51:36,958] ERROR {cps.helper:557} Rename title from /tmp/calibre_web/309750a2ec07f326002ea7b701266508 to /books/Unknown/Microsoft Word - Assignment Description.docx (463) failed with error: [Errno 1] Operation not permitted: '/books/Unknown/Microsoft Word - Assignment Description.docx (463)/Microsoft Word - Assignment Description.docx.pdf'
[2025-03-23 20:53:05,199] ERROR {cps.helper:960} File not found: /books/Unknown/Microsoft Word - Assignment Description.docx/Microsoft Word - Assignment Description.do - Unknown.pdf

Looking over the file system, it looks like "'/books/Unknown/Microsoft Word - Assignment Description.docx (463)/Microsoft Word - Assignment Description.docx.pdf" does exist, but when the download is attempted, it tries to find "/books/Unknown/Microsoft Word - Assignment Description.docx/Microsoft Word - Assignment Description.do - Unknown.pdf"

I'm unclear on what the cause of the "Operation not permitted" errors are, and I am actively investigating the same to see if these are related. Since I hadn't seen other issues here, I assume they might be

To Reproduce

Steps to reproduce the behavior:

1. Upload a book
2. Attempt to download that book
3. Receive 404 error

Environment (please complete the following information):

• OS: Linux
• Python version: LinuxServer docker container- latest version
• Calibre-Web version: 0.6.24
• Docker container: LinuxServer
• Special Hardware: None
• Browser: All

Additional context
I host calibre-web as a Container App in Azure, using Azure Files for the storage component. I've been doing so successfully for quite some time (max 1 replica, scale to zero, nobrl flag on the volume mounts).

This issue has been around for quite some time on my setup, but I didn't have additional time to try to debug it