Same issue. It’s broken. Version installed 19.06.20 iOS 12.3.1 iPhone X S Max. Just took a picture (scanned) a doc and it’s nowhere to be found.
Please make sure that you have updated the application to the latest version.
Check the App store if there is any pending update available.
Try once to sign out of the application and reboot the device.
Then sign-in again and check if you can scan the PDF.
If the issue still occurs, please share the application and OS version you are using.
We will be waiting for your response.