Sharepoint Online document libraries now supported
SharePoint Online document libraries are now available in canvas apps. Document libraries show up from the data sources panel when you select a SharePoint Online list as a data source. You can create experiences for your end users to view a listing of files that come from a SharePoint document library.
Document libraries have a unique icon so you can quickly discover and select them from the data source list.
The following controls are supported in the PowerApps web player:
See the documentation and limitations information at the docs site: https://docs.microsoft.com/powerapps/maker/canvas-apps/connections/connection-sharepoint-online