Upload file in aws s3 bucket using I am User Role in C#

using Amazon.S3;
using Amazon.S3.Transfer;

string accessKey = "YOUR_ACCESS_KEY";
string secretKey = "YOUR_SECRET_KEY";
string bucketName = "YOUR_BUCKET_NAME";
string filePath = "LOCAL_FILE_PATH";
string keyName = "S3_OBJECT_KEY_NAME";

var credentials = new Amazon.Runtime.BasicAWSCredentials(accessKey, secretKey);
var client = new AmazonS3Client(credentials, Amazon.RegionEndpoint.YOUR_REGION);

var transferUtility = new TransferUtility(client);
await transferUtility.UploadAsync(filePath, bucketName, keyName);

This could work but make sure that the IAM user role has the necessary permissions to upload files to the S3 bucket. Specifically, the user role should have the s3:PutObject permission for the target bucket.

Try this

var credentials = new Amazon.Runtime.BasicAWSCredentials("accessKey", "secretKey");
var config = new AmazonS3Config
{
    RegionEndpoint = RegionEndpoint.USEast1, // replace with your region
    ForcePathStyle = true // required for non-AWS endpoints
};
var s3Client = new AmazonS3Client(credentials, config);
var putRequest = new PutObjectRequest
{
    BucketName = "my-bucket",
    Key = "my-file.txt",
    FilePath = "path/to/my-file.txt"
};
var response = s3Client.PutObjectAsync(putRequest).Result;

This will upload the file "my-file.txt" from your local file system to the S3 bucket "my-bucket" using the key "my-file.txt".

Hello Saravanakumar,

Please refer below link it has given fully working demo program.

https://stackoverflow.com/a/25814973/3054222

Thanks

Naimish Makwana