Seeing how I currently see our default welcome page on your site while you said you uploaded files, I think this article is relevant for you:
The first thing to check under the “I already uploaded a website, why don’t I see it” is “Make sure to upload your files to the htdocs folder”. And I’ve checked your account, and I see that’s where you went wrong.
Please make sure to upload your website files to the folder called htdocs. Files uploaded anywhere else, including the root folder of your account, are not picked up on your site.