Best GPT client or configuration to help me build a website. Must remember coversation and view files

I've tried Github copilot but its super frustrating because it only sees the code you highlight or send it in the current thread, and often forgets code you sent three messages ago.

I just want a GPT interface that I can share my project files once and then have confidence that I can jump into a chat with it and know that it has context of my project and I can just ask it questions and get help building my website.

I'm on the paid version of ChatGPT.