Seesaw limits you to one link/video/image per Activity. Use this Google Slides template as your one link, and then add videos, photos, songs, more videos, directions, links to Google Docs, links to websites... all in one place.
Bonus! š„
This is a great way to share YouTube videos with students. By adding them to a slide, they're never on youtube.com. So, instead of getting a suggested video at the end, they just go to the next slide.