下面是使用aws s3的go-sdk上传文件，但是上传后的文件大小与实际文件大小不一致，下面是我写的代码：

package main

import (
    "fmt"
    "strings"

    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/credentials"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/service/s3"
)

// aws s3 putObject example: aws s3api put-object --bucket db-backup-huawen --key truco/rpmlist.txt(上传到bucket的位置) --body ./rpmlist.txt(本地文件)
func main() {

    sess, err := session.NewSession(&aws.Config{
        MaxRetries:  aws.Int(3),
        Credentials: credentials.NewSharedCredentials("C:/Users/Administrator/Desktop/aws.ini", "aws-huawen-root"),
        Region:      aws.String("sa-east-1"),
    })

    if err != nil {
        return
    }

    s3api := s3.New(sess)

    input := &s3.PutObjectInput{
        Body:   aws.ReadSeekCloser(strings.NewReader("C:/Users/Administrator/Desktop/baxi_MGCenter_FULL_20230211_000001.bak")),
        Bucket: aws.String("db-backup-huawen"),
        Key:    aws.String("truco/baxi_MGCenter_FULL_20230211_000001.bak"),
    }

    res, err := s3api.PutObject(input)
    if err != nil {
        fmt.Println(err)
        return
    }

    fmt.Println(res)

}

我已经严格按照文档调用了API，在程序执行过程中没有发现错误提示，我不明白是哪里出错了，下面是执行程序的输出：

以上是我上传到s3的文件，但文件大小与实际大小不一致：