I download system log covering time period when I do a success REST API call, but I can not find any HTTP msg like below expected 

(from a 2018 year log sample)

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------------------HTTP REQUEST CONTENTS------------------POST /Contralia/api/v2/transactions/2c969e2c6547d4740165b492e2a85002/document HTTP/1.1  Request Headers: {Content-Type=multipart/form-data; boundary=UI0Pf3_L4ZOvViLpJRbjHzqiQSH_bQBVubv7}  Request Message Data: 178175 bytes to be sent    ----------------END HTTP REQUEST CONTENTS----------------   

......

------------------HTTP RESPONSE CONTENTS------------------  Response Headers:  Content-Type: text/xml;charset=utf-8   

......

Response Message Data: 97 bytes received  <error><code>FILE_MISSING</code><message>Parameter 'file' required</message><args></args></error>   

///

I downloaded log in AppTier and file type PegaRULESv2.

May I know where is the HTTP msg can be found? Do I need select other tire or file type to download?