@Bruce Cox Lee
If the "System" will allow it/let you, just "Add" a new/another "Tag" for the individual/person that you want, in the "Memory" that you are looking at/have found.
That way that "Memory" will then appear for/against/in the "Memories" for the individual/person that you want.
I hope this helps.
You can also "add to album" (when you are on the display of the item) and add it to one of YOUR albums.
thus - you can actually add a memories item of another person to you own album . . .
If you are trying to attach (Tag) a memory to more than one person, that action may be taken by any contributor, not just the original one. Go to Person page of person who has the memory already tagged to them. If on a computer, double click the memory and when the image viewer opens, click on the image to attach other people
How do I tag memories of my ancestors or relatives in Family Tree?
A person in Family Tree can have up to 1,000 memories tagged to him or her. No limit exists for the number of tags for a given photo or document. However, when tagging photos, each tag needs to start in its own separate space. The system does not allow you to put a new tag on top of an existing one. If a photo has a full-screen tag, you will need to shrink it in order to add additional tags.
are you the original uploader of the memory - or is it someone else who originally uploaded it?