Bulk Write APIs: Step 3 returns "FILE_NOT_SUPPORTED" 400 Bad Request

Hello.

I am trying to upload data to Zoho using the Bulk Write APIs. So far, I've successfully uploaded zipped .csv file and received the file ID. When I try to implement Step 3: Create a bulk write job, I get 400 response:

{
    "status": "error",
    "code": "FILE_NOT_SUPPORTED",
    "message": "File not supported for bulk write",
    "details": {}
}

What I do wrong?

Here is the request I send:

{ "operation" : "insert", "callback" : { "url" : <my callback URL>, "method" : "post" }, "resource" : [ { "type" : "data", "module" : "Leads", "file_id" : "4197230000000587001", "field_mappings" : [ { "api_name" : "City", "index" : 1 }, { "api_name" : "Company", "index" : 2 }, { "api_name" : "Email", "index" : 3 }, { "api_name" : "First_Name", "index" : 4 }, { "api_name" : "Last_Name", "index" : 5 } ] } ] }