Content server connected directly to a AP ONE AC MINI

Hi Peplink Team

I have tried to configure one AP ONE AC MINI which shall be connected directly to an industrial PC running windows. This Industrial PC has local content that have to be available to the WiFi users connected to the AP.

The AP is configured in Router Mode but the WiFi users cannot see the PC connected to the WAN port of the AP. The WAN port of the AP is expecting to see a Router; in this case is necessary to configure an Infrastructure Network Topology.

How should I configure the AP which is a content server to the WiFi users connected to the same AP?

Here is a diagram: