Power Apps is great but there are some limitations. One of these limitations is drag and drop. Wouldn’t it be nice if you could drag a document into a Power App and then Power Apps uploads the document to a Document library. Well, you can do this with Power Apps.
One of my colleagues developed this drag and drop feature. In the video below you can see how a document is dropped into a Power Apps and then it is uploaded to SharePoint.
In SharePoint the document is marked as accepted and the Power Apps recognizes this and completes the upload process.
Note that it is important to run the app in play mode rather than play it in development mode as mentioned in the comments below.