Having a PhD in Engineering does not prepare me to be able to draw an arrow or a polygon in a document. Your screens are criptic and I have tried watching videos in YouTube and your help but still cannot just do it.
Do any of you own a iOS or Android phone? Why not make things intuitive?
If I type 'Draw a polygon' or draw an arrow' in your help box, just open the window to do it and it should be self explanatory.
As it is now, it looks like Windows 3.1 quality of 'only for initiated fellows' kind of software.
Hope you do not take this personally but listen to my frustration of not being able to draw anything with just looking at your screen possibilities.
Otherwise, brilliant app.