I've spent some time getting our company's Word templates available on Mac and Windows. We can also create a new Word document using our letterhead template through a SharePoint doc library. Where I'm now stuck is making these letterhead templates available through the Word Online portal here https://www.office.com/launch/word
It's possible I'm looking for any update to this question posted in July 2019 Setting Company Templates for Word Online - Microsoft Community
Any other suggestions to provide access to letterhead templates for our users through the Word Online portal?