It's doable using Smartsheet native automation and a Zapier zap. When a new attachment is added to a Smartsheet row, the zap grabs the attachment, attaches it to an email, and sends the email to a designated Outlook mailbox (individual or shared). Mine process goes a step further by using Power Automate to monitor that mailbox, and when the zap email hits it Power Automate grabs the attachment and saves the file to a designated SharePoint library and folder path.