Hi thanks for reaching out, I'm Arlene an Independent Advisor.
Have you checked if your NAS is set to use SMB2 or SMB3 instead of SMB1?
SMB1 is disabled by default in Windows 11 for security. To fix this, go to your Synology NAS settings and set Minimum SMB protocol to SMB2. If your NAS only supports SMB1, you can enable SMB1 in Windows Features, but it’s not recommended for security reasons.
You can read more about this on Microsoft’s SMB guide; here is the link: https://learn.microsoft.com/en-us/windows-serve...
Let me know if you need the exact steps to check or change it.
Regards,
Arlene D.