AWS lambda doesn't upload files to s3 bucket

Question

I'm trying to construct VOD converting system with Lambda and MediaConvert. I've defined lambda function to request MediaConvert to convert files to HLS. And I've added a trigger to execute lambda function as soon as original files upload into original S3 bucket. What I ultimately want to do here is to store transcoded files into Output S3 bucket. But when I test it, it looks working fine and returns 201 code. but nothing in the Output s3 bucket. Both Lambda and MediaConvert have every role to access resources needed. I spent 2days to figure out the problem, but had no idea what is wrong.

a part of Lambda Function I wrote:

    jobMetadata = {'assetId': resourceKey}

    print (json.dumps(event))
    
    try:
        with open('job.json') as json_data:
            jobSettings = json.load(json_data)
            print(jobSettings)
        
        mc_client = boto3.client('mediaconvert', region_name=region)
        endpoints = mc_client.describe_endpoints()

        client = boto3.client('mediaconvert', region_name=region, endpoint_url=endpoints['Endpoints'][0]['Url'], verify=False)

        jobSettings['Inputs'][0]['FileInput'] = originS3Path
        
/////some path definition///


        print('jobSettings:')
        print(json.dumps(jobSettings))

        job = client.create_job(Role=mediaConvertRole, UserMetadata=jobMetadata, Settings=jobSettings)
        print (json.dumps(job, default=str))

CloudWatch log:

{"ResponseMetadata": {"RequestId": "5a2ce993-3295-4ae8-93f4-04cd2829694e", "HTTPStatusCode": 201, .....

Lambda Role: (Lambda has AmazonS3FullAccess Role, AWSLambdaBasicExecutionRole and following in-line policy)

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "logs:CreateLogGroup",
                "logs:CreateLogStream",
                "logs:PutLogEvents"
            ],
            "Resource": "*",
            "Effect": "Allow",
            "Sid": "Logging"
        },
        {
            "Action": [
                "iam:PassRole"
            ],
            "Resource": [
                "my role arn"
            ],
            "Effect": "Allow",
            "Sid": "PassRole"
        },
        {
            "Action": [
                "mediaconvert:*"
            ],
            "Resource": [
                "*"
            ],
            "Effect": "Allow",
            "Sid": "MediaConvertService"
        },
        {
            "Action": [
                "s3:*"
            ],
            "Resource": [
                "*"
            ],
            "Effect": "Allow",
            "Sid": "S3Service"
        }
    ]
}