Ok, so you have mounted it as
/etc/auto.nfs.shares /mnt/volume1/Synology
So your files are now under /mnt/volume1/Synology and it seems you can access them there based on the screenshot.
Not sure why you are trying to access them via /mnt/192.168.1.227/?
Basically you are now all set and just need to update your sources in Kodi and use path substitution if you don’t want to rescan your library.
Please see [HowTo] Repairing File Paths with Path Substitution for details.
This is what I was looking for but as written above I think everything should just be fine now.