Create a connection to either SharePoint Online or on-premises SharePoint so that you can generate an app automatically or build one from scratch.
If you're unfamiliar with PowerApps, see Introduction to PowerApps.
As of this writing, PowerApps supports custom lists but not libraries. In addition, you can show data in some types of columns, such as Choice and Picture, but you can't update that data. For more information, see Known issues.
If you haven't already signed up, sign up for PowerApps.
Sign in to powerapps.com using the same credentials that you used to sign up.
In the left navigation bar, click or tap Manage, and then click or tap Connections.
Near the upper-right corner, click or tap New connection.
In the list of connections, click or tap SharePoint.
Follow the steps in either of these procedures, which appear later in this topic:
Click or tap Connect directly (cloud services), and then click or tap Add connection.
Go to Next steps at the end of this topic.
Click or tap Connect using on-premises data gateway.
Note: Gateways and on-premises connections can only be created and used in the user's default environment.
Specify your user name and your password.
If your credentials include a domain name, specify it as Domain\Alias.
If you don't have an on-premises data gateway installed, install one, and then click or tap the icon to refresh the list of gateways.
Under Choose a gateway, click or tap the gateway that you want to use, and then click or tap Add connection.