Hey everyone!
For my first test I made a simple character with the entire arm in one part and, apart from some small problems, all went well!
But then I created a character with the arms in parts and everything and uh--- ... it got haunted... xD;;;

It's probably a very base fix, but -- does anyone know how to solve this??
[YouTube]https://www.youtube.com/watch/I_nRRxpHaEM[/YouTube]

I replaced the og parts with the new ones in the correct folder in the PSD, and in the program the creator screen looks like: 

Layers need to overlap at the joints

Thanks for the answer! The layers overlap like one of those paper dolls with pins for joints do, but as you can see in the youtube link, they just start floating around completely unattached despite being in the correct folders with all the right points in place.
Unless you meant that the layer order was weird? ( I just used the default order it gave me )

One more thing I can think of is that you might have accidently switched up sides... left parts in right folders and vice versa

All the sprite body parts need to have longer, rounded ends like at the 2:20 min mark in CrazyTalk Animator 3.1 Pipeline Tutorial - Animate a Character from 6 Body Parts (youtube.com).

The best character rigs have the rounded ends with joint circles and pivot points just like in the template dummies.

Twitchymo Studio has a good video on this Cartoon Animator 4 Tutorial | Character Rigging using Krita and CTA Templates | Chef 2 Part 2 - YouTube