YouTube recently updated their permissions, which means you can’t play YouTube videos directly inside Grow Slides (and all other presentation softwares like Grow Slides).If you need to show a video, try:
Saving a local copy on your computer and uploading it into Grow Slides.
Switching over to the YouTube app to play your video content. Here is a tutorial on how to switch between the apps easily.
Copyright laws around YouTube videos are complex, and we aren’t able to help you download videos from YouTube.For more info, visit YouTube’s Copyright Center.