Go to Integrations and open Google Drive or OneDrive under Files. Click Connect and sign in. You can then attach and save PDFs from Documents.

Steps
- Click Integrations in the MORE group of the sidebar.
- Under Files, click Google Drive or OneDrive.
- Click Connect and sign in with Google or Microsoft.
- Open Documents and attach or save a PDF from your drive.
Calendar connections are separate
Google Drive and Google Calendar are separate connections, and so are OneDrive and Outlook. Connecting one does not connect the other. See Which integrations does FlowForce have?.
If it did not work
Browsing files fails after an update. Disconnect and reconnect the drive. This is the fix FlowForce gives on the Google Drive page.
I see Connect again. Your sign in may have expired. Click Connect and sign in again.
I cannot see Documents. Documents is in the MORE group of the sidebar. Your role may not include it, so ask an admin.