Hi,
Thanks for using the HP Forums.
If your printer is in the same network as your PC (private home network for example), once you see the prompt, go to "Advanced" and proceed to the IP address to get into the printer's Embedded Web Server (EWS). It will only prompt you once.
If you need help, this resource will show you how to enable the Webscan. (Chromebook is using Webscan to scan, depending on your printer model, you may be able to scan multiple pages)
Scanning from Chromebook
Scanning Multiple pages from Chromebook
Thanks.
I am an HP Employee. Although I am speaking for myself and not for HP.
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