I think a portion of the chaos at YVR the last few days is the relatively new requirement to upload vaccine certificates being horribly flawed (see post in other thread). If you can't get it to work online then option 2 is an agent at the airport. When I arrived at 7:35am Sunday morning the priority line was at least a dozen people deep, so I just opted for self bag tag + drop as I had about 5 minutes to cutoff. (Seems I cannot adapt to 1 hour cutoff for bags, I'm pre-programed for a 45min baggage cutoff.)