Unity Having Errors with Blender Imports

I have imported a Red Cup Model into my Unity Project from Blender and it is bugging out as you can see from the picture part of the model is invisible. If I move around in my project I can see the other parts of the model, so Unity knows it’s there it’s just where ever I face that part of the model is invisible. Is this a Unity issue?

EDIT: When I go inside the cup it renders just fine. I’m just wondering if this is a Unity issue?

These are just polygons facing the wrong way. Here’s how to see the above problem in Blender, where you can fix it.

For a cup you would need to either dupe and flip all polys or else use something like a solidify modifier in Blender.

Thanks I figured it out, could you also help me with this, do you know a shortcut for snaping vertices?

Google knows!