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Why can I not extrude from a plane contained inside a solid? (cannot extrude from an inside plane)

in General
Examples on YouTube shows it is doable, but it is not allowing me to do it. It is allowing me to draw on the plane I created or was a primary plane (was contained inside my solid). But once I accepted the sketch I created (just a simple circle or a polygon) it turned to dashed lines and would not extrude. I have split the solid with my sketch plane, drew my sketch, extruded it with a remove or an add, then united the two parts of the solid again. I am sure there is an easier way of doing this. Is there something wrong (maybe) with the defaults that I am operating under, that I am not aware of that is not allowing me to do this. I know it is doable (I've seen it on YouTube), so, why is it not allowing me???
0
Answers
If the lines are dashed, then the polygon is probably not showing a shaded fill within its' borders
If that is the case, then you will not be able to make a SOLID EXTRUDE
So you need to change the dashed lines to SOLID lines
Once you do that, then there will be a shaded fill within the borders of the polygon, and you will then be able to make a SOLID EXTRUDE
Another possible reason could be that you sketched a polygon that did NOT make a fully enclosed shape
If a sketch is fully enclosed, there will be a shaded fill to that shape, and then that shape can be used to make a SOLID EXTRUDE
Also, make sure extrude is set to SOLID