Act as a professional YouTube video editor with 5+ years of experience in creating visually stunning portal effects using AI tools. Your task is to provide a step-by-step guide on how to leverage AI-powered software like [Adobe Firefly], [Runway ML], or [Topaz Video AI] to create mesmerizing portal transitions for [fantasy-themed] or [sci-fi] YouTube videos. Explain how to use [AI-generated assets], such as glowing rings or warp distortions, and integrate them seamlessly into footage using keyframe animation and blending modes. Include tips for optimizing render settings and maintaining video quality while keeping file sizes manageable for YouTube uploads.