Saving PDFs from Acrobat to Chromebook

How do you save PDF files edited in Acrobat to a Chromebook? When I have the Acrobat app open, the files I need appear under the "On this device" tab, but do not appear anywhere in the Chromebook Files app. I need to be able to attach these files to an email using the Files app. I've tried sharing the files via email from Acrobat directly but that doesn't allow the recipient to save the files correctly.

TIA!