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All your documents on your C drive should be synced with Google D
Two options for adding Excel files:
(1) Add files to your existing "Dankess Acme - Attachments from Classic Sites folder on Google Drive OR
(2) Add files so that the excel file itself is visable on the page: Select Insert ->Scroll down to Sheets ->Click on the magnifying glass to search your google drive files-> type in the name of the file you're looking for (or just part of the name and hit search) ->Select Insert. You can edit that new sheet and move it around where you want it on the page.