You find the thing months before you do it — a corn maze, a restaurant, a post someone sent you. Share it into a jar and it's there when you need it.
iOS hides newly installed share options until you turn them on. You do this once, from any app.
It lands in that jar, pinned at the top, holding the link, the image and whatever text came with it. Open it when you're ready and turn it into a proper idea — the original is kept either way.
A web link, an image, or plain text — so most things, from most apps. Whatever the app hands over is what arrives.
Open the app once after installing it, then try again. If it still doesn't appear, restart your iPhone — iOS caches the list of share options and sometimes needs a nudge.
You need at least one jar. Make one in the app, then share again.
Still stuck? Email [email protected] and tell us which app you were sharing from.