Make sure your foot placement on the board isn't hanging of the tail. Get more speed and momentum and once you pop make sure to stay on top of the board if you lean either way you will fall off! Good luck!

go at the same angle as a 50-50, and ollie like if you were gonna lock into a 50-50 and when your above the ledge, turn and land on your tail

Put your shoulders and body weight on top of tail to not fall off. Usually if you stuck and cant slide, i bet you dont have enough speed or something need wax

Go with more speed and momentum , that way you slide and don't just land on it.

Velocidad y control

Wax the curb/ board

You may be coming at it at too much of an angle. If you do you will be ollie into the ledge and your momentum will be going in the wrong direction. As mentioned above come at it lke a 50-50 (almost straight almong side the ledge/rail) this way your momentum is moving in the direction you slide.

Wax whatever your skating and go with more speed also lean forward

Speed and wax is what you need

Speed fixes everything. No speed, no slide

I find that you have to lean back and push the board forward