Why is my file doesn't displayed on github pages?

GitHub Help GitHub Pages
#1

I uploaded a file to github, and also set github pages, but I input the corresponding link in the browser, my file is not displayed, why? :thinking:

#2

Three screenshots:

20210127_205451
20210127_2054511919×1080 186 KB
20210127_205509
20210127_2055091919×1080 150 KB
20210127_205417
20210127_2054171920×1081 96.8 KB

#5

This problem is solved.