In Scratch, you can share directly without having to upload a file.
I can't find a feature for this in Snap.
To make a project sharable:
- File > Open
- select the project from the list, don't click open, click "share"
Then go to the browser's URL bar and copy what's in it. Share that.
To save the code of your project as a file on your computer:
File > Export project
You can also do this from the community site, too! Just click on the icon for one of your projects and there is a share button on each project page.