@eray65 Providing support for working with flowpaper would be ‘out of scope’ for these forums, but you can absolutely get help understanding why you’re getting ‘page not found’ etc.
I don’t have time to watch a tutorial, can you just show exactly what files you’re trying to deploy?
Do you have a repository link?
A screenshot of the files?
You can also use the Deploy File Browser to see what files you currently have deployed:
https://answers.netlify.com/t/new-feature-browse-files-in-your-deploy-with-the-deploy-file-browser/105196