Welp, chalk this one up to user error.  I forgot the tilemap I was using was not updated within Unity so the stair tiles didnt show.  Great tool!

Hey guys

  I got a basic room in blender and liked the look but when I export it out as fbx and import into unity only some of the tiles are showing: Notice the stairs on the left 

Unity:

Blender:

Hey, just started getting into this and I really like it.  I do have a random issue where my tilemap disappears.  As in, when I am in Edit mode and click on the Sprytile Build I do not see the tilemap.  I was able to see it, but going into layout mode and then back to edit mode, it disappeared.  Is there anything in Blender that would cause it to disappear?

Keep up the good work!