Hi Mario and thanks for this follow up. Those screenshots were very helpful.
If you can access the UI but not the POST endpoint then it's not fully clear what the issue could be.
1. Try to browse to endpoint directly and you should see the following message
2. I would try to restart the TomCat service completely so if you're comfortable with executing commands to a running docker instance then attempt that
3. Usually, the Java logs are the most helpful and would likely provide further detail - check the logs in the following location, this would again be inside the container itself, I run a non container instance
4. Certain files may not have been extracted or are not present so the Static UI is accessible but the API Controller may not be
Logs From My Local Windows Instance
Success From My Local Windows Instance
Thanks - Mat