Explanation:
To access data sources on premises from your logic apps, you can create a data gateway resource in Azure so that your logic apps can use the on-premises connectors. Box 1: From an on-premises computer, install an on-premises data gateway. Before you can connect to on- premises data sources from Azure Logic Apps, download and install the on-premises data gateway on a local computer.
Box 2: From the Azure portal, create an on-premises data gateway Create Azure resource for gateway After you install the gateway on a local computer, you can then create an Azure resource for your gateway. This step also associates your gateway resource with your Azure subscription. Sign in to the Azure portal. Make sure you use the same Azure work or school email address used to install the gateway.
On the main Azure menu, select Create a resource > Integration > On-premises data gateway.

On the Create connection gateway page, provide this information for your gateway resource. To add the gateway resource to your Azure dashboard, select Pin to dashboard. When you're done, choose Create.
Box 3: From the Logic Apps Designer in the Azure portal, add a connector After you create your gateway resource and associate your Azure subscription with this resource, you can now create a connection between your logic app and your on-premises data source by using the gateway.
In the Azure portal, create or open your logic app in the Logic App Designer. Add a connector that supports on-premises connections, for example, SQL Server.
Set up your connection.
References:
https://docs.microsoft.com/en-us/azure/logic-apps/logic-apps-gateway-connection