After taming a horse in a new creative flat world, the game would not let me place a saddle or armor on the horse. Opening the horse GUI and tapping the saddle or armor in my inventory did nothing. Same was observed when taming a donkey.
I expected the saddle and armor to be applied to the horse.
Samsung Galaxy S6 (SM-G920W8), Android 6.0.1 MCPE revised 0.16.0 Beta build 1 (aka v0.15.90.1)
UPDATE by [Mojang] MissMarzenia (Aleksandra Zajac)
This bug has been reported to our internal bug tracker for further testing and a fix.