Problem with making holes

Hi! I’m trying to make a hole through of an object using the roundhole tool, but when I make the hole, it doesn’t go through the other side of the object, it pushes the bottom out instead creating a cylinder on the other side, like this:

This is the object I’m trying to drill through and I’ve marked the spot where the hole needs to be with a cylinder. Can anyone tell me what i’m doing wrong?

Try joining the object surfaces together into a single polysurface. The “other side” needs to part of the same surface/polysurface as the surface/polysurface the hole is placed on.

It works! Thanks a ton, I’m new and I’ve been trying to make this work for longer than I’d like to admit. Cheers!