I've made plum jam, plum syrup and plum fruit leather. The fruit leather is quite easy to make. As I am getting older simplify is one of my favorite words.
Of course you can find any recipe of fruit jam on line our from your friends and family
Just blend up your seeded plums (peel and all) add a bit of honey if needed. Line a cookie sheet with plastic wrap and pour plum mixture to a thin but solid layer. Bake at 200 degrees for an hour and check. Just keep cooking until it doesn't feel wet to the touch. Cool, peel of plastic and cut and wrap as you roll. It keeps well in a cool place.