Choose the Panopto Library media option in the Rich Content Editor. (If not visible, click the three lined dots to reveal the "plug icon". Follow the purple line below.)
Choose the assignments folder for your course by clicking the dropdown menu:
The “Quick access” list displays all the assignment folders you’ve accessed recently. The “All folders” list displays the assignment folder for each course you’re enrolled in (past or present).
Click “Choose”
Click the radio button to the left of your video, then click the “Insert” button to send the video to Canvas (you may have to scroll down to see the button):
Type a comment or note to your instructor in the “Comments” box, then click “Submit Assignment:”
The message “Assignment successfully submitted” will pop up to confirm your submission: