What am I doing wrong with my bonsai? Does it need moss?

I got the bonsai with moss a little dry.. I got the moss all moist and it seemed healthy, so I kept the plant inside beside a window, and the plant looked like it was dying after a week or two... So I put it outside to get full sun (it usually gets hot around here), and the plant looks healthy but the moss is completely dried up no matter how much water I use... 
So does the bonsai need the moss..? What am I doing wrong..? 

babyboomer10012021-03-24T17:10:27Z

Putting it in the sun is wrong.  You might have killed it.  It should have indirect sunlight only.  I have two and they are about 6' and 8' from the window.  Not on a window ledge beside the hot glass.  I use orchid moss for orchids only, not in a bonsai.  I've never seen a bonsai with moss.  Care:  Do not let it dry out.  I have a large one that I water about every 3 weeks.   My small one - every week.  Water thoroughly in the sink.  Let the water flow through the bottom.  Do not let it sit in water.  Fertilize from time to time.  I think they say monthly but I don't do it that often. 

Ben2021-03-24T03:26:43Z

The moss is just decorative. 
Bonsai do usually need very frequent watering, though, as they have so few roots and such a small amount of soil to hold water.