I do not have either Royal or Elite as game mode options when building a new map... (in the map type selection).

All I see are these:
BattleArena
MeleeArena
RealmArena
SiegeArena
TimeAttackArena

and as a test, I added:
ObstacleArena

... were Royal and Elite left out on purpose?

For elite, you should open the separate elite title pack station. I suppose it might be the same for royal.

Thank you -- I will try doing that. I was opening the main 'Storm' tile then choosing to create a map. When I add mods, where is the proper place to add the files? I just put the Obstacle mod in a spot that I knew the program would see.