Flask application deployed through Elasticbean stalk unable to load file in S3

Hi,

I am getting below error when trying to upload files in S3 bucket. I checked policies and updated them but still getting error.

2023-01-01T16:08:29.758+05:30
Jan  1 10:38:29 ip-172-31-40-199 web: boto3.exceptions.S3UploadFailedError: Failed to upload static/uploads/alexa.wav to myflask/alexa.wav: An error occurred (AccessDenied) when calling the PutObject operation: Access Denied
Jan 1 10:38:29 ip-172-31-40-199 web: boto3.exceptions.S3UploadFailedError: Failed to upload static/uploads/alexa.wav to myflask/alexa.wav: An error occurred (AccessDenied) when calling the PutObject operation: Access Denied

Jan  1 10:58:40 ip-172-31-40-199 web: ERROR:aws_xray_sdk.core.context:cannot find the current segment/subsegment, please make sure you have a segment open

Bucket is public and policy applied is

{
    "Version": "2008-10-17",
    "Statement": [
        {
            "Sid": "myflask-allow-permission-for-saving-audios",
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::377727317375:role/aws-elasticbeanstalk-ec2-role"
            },
            "Action": [
                "s3:PutObject",
                "s3:ListBucket",
                "s3:ListBucketVersions",
                "s3:GetObject",
                "s3:GetObjectVersion"
            ],
            "Resource": [
                "arn:aws:s3:::myflask",
                "arn:aws:s3:::myflask/*"
            ]
        }
    ]
}