Rey Mark

*Edit: "red_sandstone_stairs" : {
"isotropic" : {"up" : true, "down" : true},
"blockshape" : "stairs",
"textures" : { "up" :"redsandstone_top","down" : "redsandstone_bottom", "side" : "redsandstone_side"}

*I forgot to put red-next to sandstone_top,bottom,side.

Inside the "blocks.json"-------------
Path: assets/resource_packs/vanilla/blocks.json

Original/Unchanged Code:
"red_sandstone_stairs" : {
"isotropic" : {"up" : true, "down" : true},
"blockshape" : "stairs",
"textures" : "redsandstone_side"

Fixed/Changed Code
"red_sandstone_stairs" : {
"isotropic" : {"up" : true, "down" : true},
"blockshape" : "stairs",
"textures" : { "up" : "sandstone_top", "down" :
"sandstone_bottom", "side" :
"sandstone_side"}

MCPE version 1.2.13.60
(Android 5.0, S Note 3)