You can export the native .OBJ file after you have completed a scan by, first, clicking on the scan that you’d like to export, and then clicking on the Date/Time Stamp of that scan on the upper middle of the screen. Once you click in it, a drop down with the following options will appear: Delete Scan, Rename Scan, and Email Scan. Click on the email scan to open a modal of the Mail App.
Please keep in mind that you’ll need to have an email address setup within the Mail App before you are allowed to send emails from Canvas.
Alternatively, you can use the iTunes files transfer service. You can find more information about it here: https://support.apple.com/kb/ph12318?locale=en_US