Cannot get API fileUpload to work

Cannot get API fileUpload to work

I am trying to add a file to an Accounts record and the system is not returning a result of any kind:

Here is the log from my PHP Curl Post routine (other methods such as getSearchRecords work fine using the same routines)
The Params is the array supplied to CURLOPT_POSTFIELDS. 'id' is the value of the ACCOUNTID field associated with the record of interest from a getSearchRecords result.

Curl::post
Url: https://crm.zoho.com/crm/private/json/Accounts/uploadFile?authtoken=mytokenhere&scope=crmapi
Params: Array(
    [content] => @/tmp/b2d-JbJvMY
    [id] => 1144256000000068029
)