Snapping pen tool to perspective grid lines

Here's a link to a video tutorial about Perspective Grid that might help:

http://www.jeffwitchel.net/2014/05/now-perspective-grid-is-amazing/

Hey,

Normally you first have to draw a line on the perspective grid (with the pentool). When your 'on' the grid, the smart guides (make sure they're turned on (View > Smart Guides)) will say: "on".

When moving an object with Perspective Move Tool, it Smart Guides will also say "on", when you're on the grid. Normally it will just snap to other objects like it's normally doing.

When nothing happens, make sure you've selected the right grid side: Just click on one of the sides, or use 1, 2 or 3 on your keyboard.

I hope this works for you!