Firestick stream from NAS help topic

Hi;

I have set up my Firestick.
Sideloaded Kodi.

I want to be able to stream movies, etc. from the NAS to the TV and will it be possible to do it when away from home as I can do with my android phone?

When I go into setup on the stick, I see my network and then my Synology 212j NAS. I am using the windows (smb) function. When I click on the NAS, it gives me an error window. It does not connect.

I need specific directions on what to do. Is there a change on the NAS I need to make or a setting on the Firestick I need to change?

I can access the NAS from my computer, android phone, etc.

Thank you.