I was testing Krita on Samsung tab S7+ for animation but I didn’t find a way to move the marker back and forth in the timeline i.e. scrub. I also was unable to zoom in and out in the timeline. I tried the usual pinching with fingers but it didn’t work.
Still trying to figure out if Krita is usable on android for animation, specifically when not using a keyboard. I’m wondering if it’s possible to set the s pen side button to behave as right click? I think currently that button acts as mmb and holding down the pen to the screen is right click. But that makes it impossible to for example delete multiple key frames in the timeline.
I’m not sure about the S-pen.
You can select multiple frames using a paintlayer without frames above or below your animation layer. And delete with the remove keyframe button in the animation docker or add the function to one of the toolbars. Settings… → Configure Toolbars…