Simulating File Upload through Vugen

I am Facing a challenge of Uploading a File (Can be any type) through Vugen Script . While trying to correlate , I found that there is a huge value which is coming in the Upload transaction is similar for Multiple Requests . The value (40UHVibGljJTIwRm9...) is coming in the Request Header in the generation log  and unable to correlate the value . This is Open Text Application  . I am seeking for your suggestions to fix the issue . I am pasting the particular request below 

web_custom_request("{Corr_JobID}",
"URL=https://urlname/otmmapi/v1/jobs/imports/{Corr_JobID}", (https://urlname/otmmapi/v1/jobs/imports/{Corr_JobID})
"Method=PUT",
"Resource=0",
"RecContentType=application/json",
"Referer=https://urlname/otmm/ux-html/index.html?p=" (https://urlname/otmm/ux-html/index.html?p=)
"folders%2F2f1294566e9b3310d8f2b2a12c4c31e2e2cc52f5%40UHVibGljJTIwRm9sZGVycyUzQyUyNiUzQiUyNi8lM0UyMDEyJTNDJTI2JTNCJTI2LyUzRVVTJTNDJTI2JTNCJTI2LyUzRU1rdF9QbGFuX1Rlc3QlM0MlMjYlM0IlMjYvJTNFQmFja1RvU2Nob29sJTNDJTI2JTNCJTI2LyUzRUZseWVyJTNDJTI2JTNCJTI2LyUzRVAyMzQ1JTNDJTI2JTNBJTI2LyUzRUFSVEVTSUEuUFVCTElDLlRSRUVOJTNDJTI2JTNCJTI2LyUzRWM3Y2E1YWZmNTgzODRjZjFhYjVmYzY5NWVjMzkxNjhhNzNkOTA1ZDYlM0MlMjYlM0IlMjYvJTNFYzMyZGI1ZTY5NGFlMmU5ZWFjMWY3NzYyMGNlMDA3OThhOTU4ZGJjYyUzQyUyNiUzQiUyNi8lM0U3MjViMzg2Y2QxNGFhMzk1NGEyO"
"DFkNzlhMmRiMTc4ODUwYzRjY2NjJTNDJTI2JTNCJTI2LyUzRTM3NzM1YzNjYzE3ZWZkZDU2NDdiMmUyODY4YWMyZTI1ZmFlMDA4NjIlM0MlMjYlM0IlMjYvJTNFYmM4MDI2ODhhYzIwMzRjYjVjNGVhMmMzNmZiOWZkYmI1NTBmMGMyYyUzQyUyNiUzQiUyNi8lM0UyZjEyOTQ1NjZlOWIzMzEwZDhmMmIyYTEyYzRjMzFlMmUyY2M1MmY1%400x100xasc_xNAME",
"Snapshot=t229.inf",
"Mode=HTTP",
"Body=-----------------------------7de3425b0584\r\nContent-Disposition: form-data; name=\"import_template_id\"\r\n\r\n{Corr_TemplateID}\r\n-----------------------------7de3425b0584\r\nContent-Disposition: form-data; name=\"parent_folder_id\"\r\n\r\n2f1294566e9b3310d8f2b2a12c4c31e2e2cc52f5\r\n-----------------------------7de3425b0584\r\nContent-Disposition: form-data; name=\"import_job_id\"\r\n\r\n{Corr_JobID}\r\n-----------------------------7de3425b0584\r\nContent-Disposition: "
"form-data; name=\"manifest\"; filename=\"blob\"\r\nContent-Type: application/json; charset=UTF-8\r\n\r\n{\"upload_manifest\":{\"master_files\":[{\"file\":{\"file_name\":\"apple.png\",\"file_type\":\"image/png\"}}]}}\r\n-----------------------------7de3425b0584\r\nContent-Disposition: form-data; name=\"file_name\"\r\n\r\napple.png\r\n-----------------------------7de3425b0584--\r\n",
LAST);