How do I convert morphs to costumes?

For example, the cloud icon used for Snap!Cloud.
I would like to use it in my custom block pack.

Shift-click the Snap! icon in the corner of the window and enter dev mode. Then right-clicking any morph will give a menu that includes the option to make a picture of that morph (like a script pic). This is how I make the pictures in the manual. :~) has a block for that.

I mean morphs like the world morph.

whenever I try that, it opens a blank tab.

Oh. i'm just writing this to acknowledge that I read your post

is this what you want?

Sigh... use Firefox instead of Chrome. I should have said that, sorry.

it worked in chrome:

I'm not sure what I'm looking at in that picture.

it looks like he's talking about new morphs, not pictures of morphs.