If you have logged in and you are not able to see your content it should be because you have logged in before and there was no content in your account.
What you have to do is reset first logins.
To do this: Go to your scenario > Resets > Restart from first login > Everyone
Then, upload your scenario and your content should appear.
If this doesn't work, maybe you've lost your connection. Refresh your browser and log in again.
Another issue that can be causing this problem is that your scenario won't run twice in the same browser. This means that, if you want to play your scenario twice (or more) in your device, you should use:
- Incognito mode
- Another browser