Thank you for your post.
It sounds like you don't have a static IP address. The IP address may be assigned to you by your internet provider. Check with them to see if it is a dynamic or static IP address.
If it is a static IP address, make sure your internet provider allows port 5003 to be available outside of its network as well as ports 16000 through 16018. This will allow others to access the file outside of the subnet.