Hi @heyjay
Correct.
There isn't currently a way to match file attachments or discussions for Smartsheet Triggers or Actions.
Just wanted to follow up here to note that we’ve got an existing feature request for the ability to select the file object or a download link for Smartsheet attachments which would allow them to be uploaded to OneDrive.
We don’t have an ETA on when this will be possible but have added @heyjay’s vote for that feature request. We’ll be in touch by email as soon as it’s implemented! :)