This tutorial will explain you about how to create custom IAM policy to access S3 Bucket using AWS Policy Generator
AWS Policy Generator
AWS policy Generator is a tool that is used to create custom policies easily and correctly.Using this tool you can create different policies like S3 Bucket Policy, SQS Queue Policy, VPC Endpoint Policy , IAM policy and SNS Topic policy.
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https://devopsmyway.com/aws-policy-generator-create-iam-policy/