I don't think I forgot something, or then multiple times since I restarted multiple times, but I'm unable to get the texture to display
Here is my result:
Nevermind, I had to resize the VBoxContainer... it was just the size of the label+button (I don't know if it was normal or not)
These kinds of things happen, especially with UI as Godot has a really complete and complex UI system. Glad you could figure it out!