The short answer
Choose Cloudflare Access when you already have an application, origin, and hostname that need an identity-aware proxy. Choose internalpage when the deliverable is a finished HTML file, Markdown document, or OpenAPI spec and you want a private rendered link without operating a separate hosting stack.
- Existing app or staging environment: Cloudflare Access
- Generated report or document artifact: internalpage
- Device posture and network policy: Cloudflare Access
- Upload, render, and replace one private page: internalpage