Survey flow: Show a question only to particular groups after randomization

Hi everyone,

I want to create a randomized study in Qualtrics. I have 6 groups (video 1, video 2, video 3, written 1, written 2, control). First, all participants get the same questions. Then the participants get randomized into one out of the 6 groups in which they either watch 1 out of 3 videos, read 1 out of 2 texts, or they are part of the control group. Afterward, all participants will be asked again the same questions. Then only the group's video 1, video 2, and video 3 get a question if they knew the actor displayed in the videos (called the "know actor question"). Following, all groups get the same questions again. Therefore:

1. Same questions (Demographics)
2. Randomized
3. Same questions (Questions for dependent variable)
4. ONLY QUESTION FOR VIDEO GROUP 1-3
5. Same questions (Other questions)

My question is on how I can present the “know actor question” block to only some of the participants when they afterward get presented with the same questions again.

Thank you!