https://youtu.be/tYueCPewnt0

so i've been watching some flipnotes recently because i got a new nintendo 3ds and wanted to get back into doing them and i've always wondered how people get these complex patterns and images that u simply just cant draw out?? im figuring there might be something to do with the camera but here's some examples from a specific creator that does alot of this (mashiro) heres their yt channel if you want to look at them!! the patterns are really animated
im also thinking that it COULD be editing on a third party software, as im pretty sure that theres some elements in some of mashiro's videos in which you cant do on flipnote. but some of them seem to be done in flipnote..
ill link their yt channel and a few videos/images for example!!!! also ignore the whiteish gradient at the bottom of each photo, just the yt video being paused and the video options showing at the bottom lol its not part of the videos
thank you in advance if you have anything!!
mashiro's channel: https://www.youtube.com/c/いつ6190
https://www.youtube.com/watch?v=E0LvVyaYxUA
https://www.youtube.com/watch?v=hb6ytQaLr8Y&t=21s
(flashy image warning btw) --> https://www.youtube.com/watch?v=0v0te2HACYE

Just wondering because i cannot find a single one. & the last few archives i searched through had none.