Error uploading file to Box(HTTP/1.1 415 Unsupported Media Type

Certified Associate Developer

Hi.

I was trying to upload a file to Box from Appian, but the following error occurred, so I am posting this.
I'm getting a Media Type error, but I'm not sure if the Request Body is written incorrectly or if I'm not connecting to Box's upload API.
If anyone knows please let me know.
Details below.
・Integration Object

・Box account
Free version for individuals
 
I'm guessing that the upload API cannot be executed with the free version of Box, so if you know anything about that, please let me know.
 
We apologize for the inconvenience, but please.



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