File uploads failing with status code 404 + upload progress events not being triggered

I’m getting the error, “Source map error: Error: request failed with status 404
Resource URL: null
Source Map URL:” when uploading a file using DropTarget with autoProceed: true. The error implies that the file being uploaded isn’t present on your device but that isn’t the case. Interestingly after I drag and drop the file into my browser window and then use uppy.upload() method on a button, the upload succeeds. Moreover, I’m using the uppy.on method to capture 3 separate events namely, “complete”, “upload-progress” and “progress”, but none of these events are being captured whenever the upload proceeds.