How to make NAS storage running in Windows Server 2016 accessible from outside office network?

Hi,

I am having a requirement to make the NAS which is on our server running Windows Server 2016 and right now accessible within the office network. Now we want to make NAS accessible from anywhere outside the office. I haven't done this before, so I am confused about how to accomplish this.

We have one public static IP that we want to utilize if required.

If anyone can help me in doing this job would be highly thankful and appreciable.

Thanks.