I have a Huawei router model DN8245X6 with an x20 I am trying to set up a file server but what ever I try i cannot get it to see through the router. Whenever I run a test I get this message.

Test failed server does not answer
behind router enable to forward port 80 to computer

The file server is connected by cable to the router

I have optical network terminal model type 300

Huawei router model DN8245X6
Deco X20 in access point mode

Paul