I use Link for story boarding/mind mapping! I love the app and it really fits my needs! I plan on using this app for future stories too, if I ever upload them I'll hit you up and show 'ya!
Tad unfortunate that images can't stay transparent because I was planning on making little designs on notes to make'em cute but aye, I'll take what I can get!
I'll be following you and your future projects~<3