Saved .eml files on network folder appear blank when reopened

Hello, I’m experiencing an issue when saving email messages as .eml files from Thunderbird. When I save a message to a network storage folder (for example, a shared drive or NAS), the file seems to save correctly, but when I try to reopen it later, the content is completely blank — the message body is missing. If I save the same email to my desktop or a local folder, the file opens perfectly and displays all content as expected. Environment details: Thunderbird version: 140.3.1esr Operating system: Windows 11 Network storage type: NAS Has anyone else experienced this issue? Could this be related to file permissions, encoding, or how Thunderbird handles .eml files on network paths? Thank you for your help!