@John 的解决方案有效，但我想将某些步骤添加到他的答案中.

@John's Solution works but there are certain steps I would like to add to his answer.

• S3 存储桶和 Lambda 需要位于同一区域.例如，两者都应在 us-east-1 区域中创建.不同的区域会抛出如下错误:

• The S3 bucket and the Lambda need to be in the same region. For example, both should be created in us-east-1 region. Different regions would throw an error as below:

通知目标服务区域对存储桶位置约束无效

The notification destination service region is not valid for the bucket location constraint

以下是我创建触发器的步骤:

Below is the Steps I followed to create the trigger:

Account-A.S3-bucket -> Account-B.Lambda-function

1. 从终端，切换到 Lambda 所在的账户 B 的 AWS 配置文件

2. 运行以下命令，为您的案例更改参数:

1. From Terminal, switch to Account-B's AWS profile where the Lambda would reside

2. Run the below command, change the parameters for your case:

aws lambda 添加权限 --region {Account-B.Lambda 区域 例如.us-east-1} --function-name {Account-B.Lambda 名称} --statement-id 1 --principal s3.amazonaws.com --action lambda:InvokeFunction --source-arn arn:aws:s3:::{Account-A.S3 名称} --source-account {Account-A.account-id} --profile {Account-B.profile-name}

在这种情况下，您可能会收到 statement-id 存在错误，增加 statement-id 并重新运行命令.

You might get statement-id exists error, increment statement-id and re-run command again in this case.

1. 转到Account-A 的S3 存储桶和属性 的标签下> 事件
2. 选择添加通知

3. 添加以下字段:

1. Go to Account-A's S3 bucket and under Properties's tab > under Events
2. Select Add Notification

3. Add the following fields:

名称:ObjectCreation事件:ObjectCreate(全部)发送至:Lambda 函数Lambda:添加 Lambda 函数 ARNLambda 函数 ARN:your-lambda-arn

注意:Lambda 函数可能仍会显示错误，但 S3 存储桶中添加的新对象会触发 lambda 和打印(事件)日志出现在 Cloudwatch 日志中.

Note: The Lambda function might still show an error but new objects added in the S3 bucket trigger the lambda and print(event) logs appear in Cloudwatch logs.