GQueues integrates with Google Drive so users can attach existing documents to tasks and upload new files. As the Google Workspace Admin, to make sure everyone on your domain has the ability to attach files, you must Allow users to install Google Drive apps on your domain:
Log in to your Google Workspace Admin Console at at http://admin.google.com and click on Apps then Google Workspace, then Drive and Docs.
Click on Features and Applications and the Drive SDK.
Check the box to Allow users access to Google Drive with the Drive SDK API and click Save.
That's it! Now your users will be able to attach relevant files to their tasks so everything is accessible from their GQueues home base.