When this guy click, his computer display the folder “resources” and he click on the name of his objects then he have all the animations.
But me when I click, i’m on “My project” and there are nothing.
He only has renamed his project and added resources to the project folder. (or you started an empty project and he the platformer example)
You can also add your graphics for animation there.
C:\Users\USERNAME\Documents\GDevelop projects\My project
Or navigate in the opened file explorer wherever your resources are and then confirm GD should copy it into your project folder.