Browse to Modern Site Collections in Office apps Save As Dialog

When you save from an Office app (Word, Excel, etc.) to SharePoint online you can connect to the SharePoint service and browse the root site (tenantname.sharepoint.com) and sub sites and workspaces. Works great and reasonably easy to teach users to save documents in the right place.

Now that we are creating lots of modern site collections, the only way to browse to a new site collection is to change the URL in the Save As dialog to read tenantname.sharepoint.com/sites/sitename.  This requires that I know the specific URL name of the site collection (and that I know /sites/ is also required) - I can't browse the available site collections.  Over time I know that I will build a list of recently visited options and can pin specific document libraries, etc., but in the shorter term it seems to me that there are great leaps of logic that users must make to find the right place to save.  I've found myself sitting at a computer and opening documents in different libraries so that we can pin the sites to the Save As dialog.

My guess is that it works this way in part because the Office app itself doesn't know what a user's permission is on any given site collection (or whether they have access at all).  Having said that, if you're signed into Office365/SharePoint/Word the information is available which could say "show this user site collections to which they have access"

Any suggestions on techniques for easing the pain on this?