Here’s how you can connect to an external data source which is SharePoint in this case from Power Apps Maker portal!
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Create Dataverse Virtual Table from SharePoint List | Power Platform
Now, you can create a Dataverse virtual table by referencing a SharePoint List. This is an easy way to bring in schema from your SharePoint List in use and make it into a Dataverse Table. Good news is that this also syncs back to the SharePoint List! Let’s see how.
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