In reply to Steve Beakley.

I think this is possible, yes. Using the HTTP PATCH method, you can modify the attributes of an Item ("Drive Item" like a folder or file) in SharePoint or OneDrive. You would pass in JSON data like this:

"fields": {
"Tag": "NEW_TAG_VALUE"
}

I don't have any examples implemented in SAS, but check out the API doc for Update Item.