Screenshot is easier to understand than text, so screenshot first.
"own" | "not own" |
---|---|
(Obscured URL: this for not own, this for own.)
When you select "This file is my own work.", then you select "The license is described by the following wikitext (must contain a valid copyright tag):", no wikitext box appears.
However, when you select "This file is not my own work.", then "Another reason not mentioned above", the correct wikitext box appears.