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It sounds like you are trying to access a WAN hosted file using a LAN address.
You are no longer on the local network, you need to access the server via it's "external" IP address.
Is your network configured with a static IP address?
Read up on this entire how to:
Go to Manage | External Data Sources and review what you find there. It's possible that you have a no longer used reference to a copy of this file via a relative path reference or an explicit path reference that is not valid when you use a different device to connect to the solution, but is valid--referencing a copy used during development perhaps when you use your original device to access the solution.
The FMSA server is on the same LAN when I develop this FM solution. And I have DDNS when I access remotely into the FMSA. And at time I can get pretty confuse as I must admit I am not good in networking. But now it is solved and I can continue with the development. Thank you guys. Awesome!