Students haven’t been posting their finished gifs into wordpress. After you make your animation then save it as a gif in game maker. Then I found you have to load it in GIMP and save it there, otherwise it won’t loop. Finally, upload it to wordpress as a full size image, not a thumbnail. Then you can see your animated gifs in wordpress! Remember to do a hard one (different sized frames) as well as an easy one.
problem 2:

2) Make an animation from a strip sheet of stills.

a) one where all the slides are the same size (easier)

b) another where the slides are of varying sizes (harder)

Solution:

Hint:

Sprite editor > File > Create from Strip

Sprite editor > File > Add from Strip

Hint: For slides of varying sizes start with the largest size and add the smaller sizes later and rearrange order. It can be a fiddly, tedious process!

Suitable strip sheets are astro_sheet.gif, shadow_sheet.gif, kadotsu_sheet.gif