Stock and video browse are optional. You can always upload an image or paste a YouTube / Vimeo URL.

Stock photos
Connect Pexels and/or Pixabay (API key, free tiers exist). Then Image, Cover, and Landscape blocks show a Stock picker.
Use this for a hero image when the client has not sent photos yet. Prefer their art for case studies.
Video
The Video block accepts a public YouTube or Vimeo URL without connecting an account.
Connect YouTube or Vimeo only if you want to browse a library instead of pasting.
Tips
- AI must not invent image or video URLs.
- Logo wall and Related work still want your files.
- Check Preview → Website: embeds are for the share page, not always for print.