I am a Power Automate Engineer with plenty of experience working with APIs and I have never seen such a documentation where even the AI which I took help from was even despairing. The funny part in here is that the API itself has just very very few endpoints, means it is tiny but even that is not maintained in a proper way...

See yourself what the AI finally said:

"The example you showed has name="" which appears to be incomplete or a documentation error. Most file upload APIs require a specific field name. Based on standard practices and your earlier working attempts, name="file" is likely correct."

"Missing body in their example
Their example is incomplete - it shows the headers but not the actual file content that would follow after the Content-Disposition line."

This 1 Taco remains here until the API is being maintained in a proper way. As soon as thats done, we can have a look at it and maybe change this rating.

And do me a favour and don´t try to blame me for not being able to integrate a simple API endpoint. I do this already since many years. Thanks.