Hi,

I have a small problem and couldn't find the answer. When I move photos to Lightroom, I can edit keyframes and copy the edits to the next keyframe, but the settings are only copied between the keyframes and not to the rest of the photos in between.

And this is exactly how it should work.
From the "Instructions" page: https://lrtimelapse.com/workflow/visual-workflow/

Auto-Transition reloads the metadata for the keyframes and calculates the transitions for all images in between the keyframes.

Exactly. In Lightroom you edit only the keyframes. LRTimelapse will then later calculate any inbetween images when you do the "Auto Transition". Also check out the basic tutorial: https://lrtimelapse.com/tutorial