'PutObject Access Denied when uploading csv file to S3

I am trying to use boto3 to upload csv file to s3, but I got "access denied" error. below is part of my code. My IAM role is only grant "PutObject" permission for "my_bucket/google" folder but not the bucket's root.

###
df_pandas = df_spark.toPandas()
bucket = "my_bucket"
path = "google/report.csv"
csv_buffer = StringIO()
df_pandas.to_csv(csv_buffer)
s3_client = boto3.client("s3")
s3_client.put_object(Body=csv_buffer.getvalue(), Bucket=bucket, Key=path)

part of role s3 access policy:

Action:
       - "s3:PutObject"
       - "s3:DeleteObject"
Resource:
       - "arn:aws:s3:::my_bucket/google/*"

csv boto3

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'PutObject Access Denied when uploading csv file to S3

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