No share button for iphone 12 memories videos (made by iPhone)

If you have an Music subsciption, apple will also select songs from Music for the Memory, but the Music songs are protected, so you cannot share the memory video with Music as a background music. Have you tried to switch the music to one of the Theme songs?

See: Personalize your memories in Photos on iPhone - Apple Support

Change the music

You can change a memory’s music by choosing from memory soundtracks or suggested songs in Apple Music. Apple Music subscribers can also access their Apple Music library and view suggested songs based on musical preferences or the content of the memory.

1. Go to the Photos app  on your iPhone.
2. Scroll down to Memories, then tap a memory to play it.
3. Tap the screen, then tap .
4. Tap , tap a song, then tap Done.
5. Apple Music subscribers can tap  to search for songs in the Apple Music library.

On step 4 select a theme song, not a song from your Music Library

So I can’t share memories made by my iPad anymore. When I check this it seems like the answers never work. Like Leonie above. What use is that? I didn’t chose the music. The iPad did and I don’t know how to change it. I just want to share the memories like I used to.

The Memory in Question is probably using a sound track that is protected by digital rights. You can only share memory videos, if the audio track is using free music.

Try a different audio track.