Q.I have a Frangipani Plumeria x stenopetala
It has brown spots on the leaves and it is really special to me and I don’t want to lose the plant. Please help. Thank you very much!

Certified GKH Gardening Expert
Your plant may have contracted a disease or pest. Check out this article: https://www.gardeningknowhow.com/ornamental/flowers/plumeria/pest-control-for-plumerias.htm
You'll need to give the plant a good cleansing with an insecticidal soap, neem oil, or even rubbing alcohol on a cotton ball.
Here's another article that may help: https://www.gardeningknowhow.com/plant-problems/environmental/what-causes-brown-edges-on-leaves-of-plant.htm