For full-time students, proof of residency can be obtained in the form of bills, leases, or any other legal documents that show the student and their family live where they say they do.
You must obtain proof of residency at least once for any full time, in person students, upon enrollment.
MDOL's: You MUST obtain proof of residency every year. This is to show that despite the student being online, the student is still a resident of Colorado and is eligible for CO state funding.
You can put proof of residency either in Dropbox, or in the student's bio in Alma (using the file cabinet).