There's an existing thread with the same topic as this one but the difference is that the old one doesn't have any images to make it more easier to follow since there's an image showing where you can find what you need to navigate on the forum.
The pictorial direction makes it easier to follow like you rightly opined. I had to merit OP for their effort. Nobody will miss their way with the screenshots OP shared. Stuff like that may look easy to those who already knew how to upload it but I tell you that such may have stumbled a great number of people before they learnt it. Yours sincerely used to get confused at that too when he started participating in campaigns and had to upload such.