Mate Assembly Confusion - Slider Mates, Tangent Mates - Ball, Tube, Slot

HI, I am having a heck of a time figuring out how to properly apply mates in the assembly tab.

What I Am Trying To Accomplish.
There are currently 4 parts. A tube, a ball, a slider, and a rail.
I would like the ball to fall down the tube and into the slot on the slider when the left side of the slider is under the tube. The ball should fall into that slot, the slider then moves to the left, the ball rolls in the slot, not being pushed out due to the tube holding it in place, then when it is all the way on the right side the ball can fall through the hole.

What Have I tried.
I currently have the tube fixed to the origin. The ball on a slider mate down the center of the tube, the slider has a mate to the rail, which is fixed in place. I have tried to put a second tangent mate on the ball to the slot but when i do this everything turns red and says its overdefined. When I remove the slider mate on the ball for the tangent, the ball will go in the slot but it wont stay in the tube. I also messed with the ball mate but I have no idea what that did.

I am still somewhat beginner/intermediate and trying to answer my queestions through extensive video and discussion searches but I dont' know what I don't know and am turning here finally.

Here is the link to the model if you need it.
https://cad.onshape.com/documents/af3148dc90f34a614ee46887/w/32d78f37aa47d8b386398f4f/e/4e4023759f75fb98c36e6a2c?renderMode=0&uiState=686733fe4af2ee0d779bf021