NOTE: Lumin is currently undergoing enhancements that have temporarily disabled this feature. We appreciate your patience as we strive to improve the Lumin experience for all users.
In the Documents list, click the More options icon next to your document.
Toggle on the Available offline option.
Click Enable to confirm offline support.
Your document will now show as Available Offline.
WARNING: If it is a Google Drive-stored document, Lumin will prompt you to convert it to Lumin storage as this feature is not yet available for Google Drive-stored documents.