I imported all the images I need. They are sketches done in PAP4. I import them as each frame. Now how do I trace over them for the line art and then remove the sketch? I make a new layer but whatever drawn on the layer is stuck on every frame now. How can I apply my line art and then get rid of the sketch underneath for animating? aLSO Adding color. Didn't see this in the faq. I don't know how I can add colour and lineart and get rid of the sketch in terms of the animation workspace. For reference, I am only using this program to do the lineart /colouring then will import it to another program. Please help, thanks.

When you made the new layer to draw your lineart, it's an image layer, not an animated layer so it doesn't have animation frames in it and its content will be seen overlaid onto every frame of an animated layer. You need to make a new layer then make it into an animated layer by selecting it (so it appears in the Timeline) then right-clicking frame-0 in the Timeline and selecting Create Blank Frame. That will make it an animated layer as is indicated by the onion skin lightbulb icon appearing in the layer properties icons.

Then you draw your frame-0 lineart, then right-click frame-1 and select Create Blank Frame which will give you a blank frame-1 to draw the frame-1 lineart on. Etc, etc.

To 'get rid of' the sketch, you just make the sketch animation layer invisible using the 'eye' icon at the left side of the layer name in the layers docker.

Krita has lineart colourising tools but they don't work on animated frames, only on an image layer. In theory (and in practice) you can extract frames from an animation, convert them to an image layer, use the colourising tool, convert the result back to an animated layer/frame and then copy/paste that frame into the original source lineart animated layer. However, that would be very tedious and confusing.

I'd suggest that you use the Fill tool for coloring your lineart on each frame by making a separate colouring animated layer under your lineart layer after making sure that it has 'closure'. If your lineart has deliberately open lines, you can make closure by completing the boundaries of a coloured region on another animated layer and unticking the 'Limit to current layer' option on the Fill Tool options when you do filling on the colouring layer.

Thanks for that. It's all good now so far!