I sent you an example (the top example), if you use this example for testing, you should get the same error, if not, then it will probably only affect my account, then you could do it with my API Try Login + Key.
Then you should definitely get the same mistake as me, I mean the message actually says it all right?
"You are not allowed to upload files", maybe you have a complete example of how to create a Local File Upload through your API?
Then I could test it, and maybe this can make the problem, I just want to help you to fix the error, I know several people who receive the same error regardless of me / my example.
Unfortunately, we can only go to the information from the API Docs. Nevertheless Thanks for the feedback, I understand in any case that you provide a lot of support at the moment, and that makes you great, because others can really take an example of it.
By the way: Your stream play buffers extream long (compared to other Stream Hosters at least 10-15 seconds at the beginning more, where you have to wait as a user), here at Central Europe Locations, do you know anything about it? Tested on several System & Locations with cache deleted. (Example Germany, Netherlands)
Best regards