To create this magic link, just go to https://onlockscreen.app/create, pick a photo and sent the link to your friend.

Check the full app https://apps.apple.com/nl/app/on-lock-screen-photos-widgets/...

Check tit out without downloading to your phone with this beautiful iss picture https://onlockscreen.app/view?imageCode=40STT (click on the link on your phone)