I have iPad pro-2017 running ios 12.3.1.. I suggest for the developers of flipaclip to make the pen get narrower and to add (undo) option in the frame view panel
Hello, there is already undo button in the frame view panel :)
Also, what do you mean by making the pen get narrower? Are you looking for an option to change the size of your pen? If that is the case just click on the pen and there is a circle icon with a little dot inside it - just slide it up or down to change the pen size.
Check the screenshots below for the location of both undo button and option to change pen size.
Pen size change button:
Customer support service by UserEcho