Rice Crispies! And what was "the one and only cereal that comes in the shape of animals"? It had a funny 4-second animation.
You'll have to explain this humor to our international members - otherwise they'll attribute it to "Lost Marbles".
Yes, the link you posted did it - I now have automatic tweening!!
Here are some notes on your second video "Drawing, Sculpting, Animating in Blender GP" which might be helpful to the viewers - please correct if I've made mistakes, you might want to post this in the forums that link to your tutorials:
Greg's Key Keys (in the order they appear in the tutorial)
Set mouse position point on screen - Right Mouse Click (RMB)
Zoom - Mouse Wheel (MW)
Pan - Shift+Middle Mouse Button (Sh.+MMB)
Brush & Sculpting Control Panel - toggle with t
Layers and Palettes Panel - toggle with n
Draw - d
Edit Strokes - Tab
In Edit Mode:
Select, deselect all strokes - toggle with a
Scaling - s (accept change with LMB)
Rotation - r (accept change with LMB)
(Both operations work relative to current mouse point)
Move Shape (with all strokes selected) - g
(also to move partial selection)
Open Sculpt Menu:
d,e simultaneously
Adjust brush size - f
Brush strength (intensity) - shift+f
Sculpt with selected tool - press & hold e (zoom level affects brush size)
Move Time Slider - RMB (either R click on point or R click + drag to advance)
Zoom in Dope Sheet - scroll MMB - focuses zoom on wherever cursor is placed
Set Animation Range - drag End Time slider
Adjust Frame Speed - a (with cursor in Dope Sheet), move time slider to Frame 1,
s + release, move mouse to scale frame distance evenly
Select desired Keyframes - up or down arrow keys
Squash Object - Move time slider between two existing keyframes and sculpt
Close gaps in sculpted object - click + pull point, LMB to confirm
Zoom out, zoom in view in Dope Sheet - scroll MMB
Create automatic in-betweens: put time slider between key frames and
with mouse cursor in camera view - Ctrl+shift+e