Problem with preview refresh and github sync

Hi everyone,
The project preview does not work once I push code to GitHub.
When I publish the project, the code is correct, but not in the preview.
Project is : Lovable - Build for the web 20x faster
The preview never updates when I modify code outside of lovable, synchronization is OK, the branch is correct.
Thanks

I already make the step 1.
For the step 2, where is the Reimport Code button ?
And, where is the menu ? : “Go to Preview > Build Settings”