Can't Draw in Animate

can you draw using a mouse (not tablet)? 

if not, reset your preferences:

1.assign (if none now exist) a custom keyboard shortcut:

2.reset your preferences* (you should not give up on this until you've tried several times)

3.confirm you were successful by checking your keyboard shortcut was reset

if it's not, return to step 2 if it is reset, check if the problem is resolved

* press and hold Control+Alt+Shift (Windows) or Command+Option+Shift (Mac OS) as you start Animate.