To log into Synology
use your quickconnect.to/
OR
http://xxx.xxx.xxx.xx:xxxx/
Log in with your name and password

If you have forgot your synology password
To reset password
https://kb.synology.com/en-sg/DSM/tutorial/How_do_I_log_in_if_I_forgot_the_admin_password
then
https://finds.synology.com/# Add to browser to find synology

In Sonos to add music libary manage, music library settings

\\Synologyxxxx\music

Remember log in and password

FTP for Windows 10 is
xxx.xxx.xxx.xx
name
password