I'm using the latest Doodle Studio 95 and Unity 2018.3.8f1 (64-bit) on Windows.
Running into an issue where if you Add -> Add as Particles, it creates a GameObject with a particle system with no material and no DoodleAnimator component. This renders as the particle system creating default magenta boxes. Adding a DoodleAnimator component and hooking up the DoodleAnimationFile manually does not fix the problem.