Hi Warssonstudio013 and Ben,
I just did some testing on both group objects and single objects and have to agree, the keyframes are not showing in my scenes either. I followed the same steps as in the video and what I did some months ago and now the yellow vertical lines showing key frames do not appear on the time line. I have the red line indicating what frame I am in but not the key frames indicating when a transform is done. Mind you, I can still make an object move by creating a keyframe and the object moves as expected only the keyframe is not identified by a yellow line. I slowly hovered over the entire keyframe to see if the popup still appeared but no popup did. I therefore cannot drag a transform keyframe up and down the timeline like I use to.
When I first created this post my problem was different. I had made several objects move and assumed I could view and move or reset all the keyframes at once even though I had not selected any objects. I later realized that keyframes are only shown when you select an object or multiple objects that have keyframes associated with them. Once an object was selected I could move the keyframe from frame 1 to frame 174 by simply dragging but because I hadn't selected the object I couldn't see any keyframes so I was lost as to how to edit or reset them all at once. When I first read Warssonstudio013's post I thought this was the problem but after testing I can see that something has changed in Clara.io since the video was made.