I also suggest using the Apple Scan while you wait for the HP software to be updated. To manually select the ADF, click Scan, click Show Details, select Document from the Type menu, then select Document Feeder from the Source menu. If an item is loaded into the ADF, HP Scan automatically defaults to the ADF as the source. In the Scan Mode menu, select Document Feeder.
To manually select the ADF, open the Presets menu, select Edit Settings, then select Document Feeder from the Source menu. If an item is loaded into the ADF, HP Easy Scan automatically defaults to the ADF as the source. Please download and install the HP Easy Scan App to see if that will allow you to scan from the ADF. However, every problem has a solution and here's the alternate solution for Sierra as we may not have drivers available for MacOS as off now: Yes, I'm afraid there have been certain known issues with the MacOS sierra updates,
