Why can't I see bouncing of a switch on an oscilloscope?
The oscilloscope is only remembering enough points to display the trace at the original resolution. If you capture a trace and then zoom in, it "spreads out" the dots, then connects them with straight line segments. This can make it seem as if high-speed features are not even there.

To find what you're looking for, start with your captured signal. Then "zoom in" to that rising edge by adjusting the time base. When you start getting close, you will start to see the rising slope of the signal.

As you do this, you will lose resolution on your captured signal. To fill in the details, you can capture new samples of that rising edge using the scope's triggering mechanism.

Once you can see the rising slope, capture a new sample. Any bouncing/overshoot/noise should become apparent.