gmail not showing images from Https AWS

I recently added HTTPS to my AWS hosting. Prior to that, emails being sent out from my applications were displaying images perfectly. Now

https://ci5.googleusercontent.com/proxy/v7JpfbV4ITosgXbBdN7ze_X9624aZVxbZpVu2dDEYBZUAMyhMoLfWzwVRiOuQOsdyRD8-f4SIc24GETF8SZnD_YE=s0-d-e1-ft#https://smartalumni.ng/images/SchoolCard.png

shows:

The requested URL: /proxy/v7JpfbV4ITosgXbBdN7ze_X9624aZVxbZpVu2dDEYBZUAMyhMoLfWzwVRiOuQOsdyRD8-f4SIc24GETF8SZnD_YE=s0-d-e1-ft was not found on this server.

That’s all we know.

While

https://smartalumni.ng/images/SchoolCard.png

displays the image perfectly.