How to drag on Crafting Table:
Change your UI Mode to Classic if your UI is currently set to Pocket
Pressure plate is used to output signal
A door can only be powered if you shoot a block next to it or shoot the door with redstone signal
or with repeater
A slab can not send redstone signal downwards, use glass instead
How to drag on Crafting Table:
Change your UI Mode to Classic if your UI is currently set to Pocket