File Submission API for External Certifications

Hello, We are trying to implement the file submission for External Certifications via File

submission  API .

According to the documentation : 

"**The steps for uploading file to S3 is same for any type of content upload for any workflow.
External Certificates -
API client has to follow same steps for external certificate for uploading the certificate in S3."

However, when we try to upload the file with the request below, we get a response : 

1. {status: "BAD_REQUEST", title: "Bad request. Check url, params and headers",…}
1. source: {info: "loResource of only 'course' loType is allowed"}
1. info: "loResource of only 'course' loType is allowed"
2. status: "BAD_REQUEST"
3. title: "Bad request. Check url, params and headers"

Can you please help with the correct syntaxis for external certification file submission?