Click here for the direct link to the file to use to share - if you share to Classroom it will be a view only file.
I recommend the following:
- make a copy of the file
- select sharing
- get shareable link, make sure to set your shareable settings - choose anyone with link
- in access make sure Anyone (no sign-in required) Can View
- Select Save
- Copy the link and share
Embedded below is a GIF followed by a 1-minute video tutorial I created showing what the Slide looks like.