Couple quick things to rule out:

• Are you clicking save before refreshing the page? Changes to the integration definition don’t get auto-saved.
• Is the version locked? If your integration version is public or if you have 5 or more Zap references using the integration you won’t be able to change the version directly. You’ll need to clone a copy, make the changes to the new version, test, migrate users to it, and promote it.  You’ll see messages like the attached at the top of the page:

It does look like we should be locking the sample input down so it’s clear that it’s not editable, but we’re not. I’ll open a bug for that. 

Hello,

of course I have saved before :)

The integration is private and has no 5 users, but unfortunately it still does not work. I have tested the same with a clone, unfortunately without success.

Regards
Andreas

Ah, got it!  Thanks for the follow up. I was able to reproduce and have opened a bug on it. I’ll post here when we get it addressed.  Thanks for raising the issue. 

Hello @Andreas.K ,

I wanted to follow up on this issue!

We pushed a fix that should be available now, it should address the issue you have been seeing. Please let us know if the issue still persists.

If not, I also wanted to verify if the Sample Data you are passing in is correct JSON.

Thanks again for raising the issue and for your patience. 

Stan