Upload File Responses with Empty JSON

Describe the bug
I am getting the following error when trying to Upload a File
Error from HubSpot, JSONResponse=Empty

Repro Steps

1. I am initiating a new FileHubSpotModel with the following properties: File, Name, Hidden.
2. File is been retrieved as byte[] from an s3 bucket.
3. Then i am calling the File.Upload method passing the file create on step1.
4. At step 3 I am getting the Error mentioned above

Screenshots

Anything else?*
On your documentation, you are using .Upload without specifying the Type. .net 5 complained about that so I had to type it as follow:
.Upload<FileHubSpotModel>(file)