
There is no direct Power Apps and Power Automate menu in SharePoint server 2019.
To work with MS flow and Power Apps in SharePoint server 2019, we need to install on-premises gateways and connect to MS flow and PowerApps cloud then implement the solutions.
For more information on setting up and configuring on-premises data gateway, see:
https://learn.microsoft.com/en-us/powerapps/maker/canvas-apps/gateway-reference
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