Where is policy of read/write AWS S3 for IAM user - amazon-s3

Question

I am adding a IAM user for read and write access to objects in AWS S3 bucket from React Native app. I plan to use signed URL to access the objects in a S3 bucket so the policy should be for programmatically access. The IAM user is created just for the purpose of read/write access to S3 bucket. When I open the existing policy to choose from, there are only 4 S3 related policy:
I can use the read only access. But I didn't find write access permission. Full access to the bucket seems to much to give. Also some of them has description of management console use and I am not sure if the policy could be used programmatically.

Answer 1

It appears that you are asking how to assign read and write permissions on a specific bucket to a specific user.
This can be done by attaching an inline policy to the IAM User. It would be something like:
{
"Version":"2012-10-17",
"Statement":[
{
"Effect":"Allow",
"Action":[
"s3:ListAllMyBuckets"
],
"Resource":"arn:aws:s3:::*"
},
{
"Effect":"Allow",
"Action":[
"s3:ListBucket",
"s3:GetBucketLocation"
],
"Resource":"arn:aws:s3:::examplebucket"
},
{
"Effect":"Allow",
"Action":[
"s3:PutObject",
"s3:PutObjectAcl",
"s3:GetObject",
"s3:GetObjectAcl",
"s3:DeleteObject"
],
"Resource":"arn:aws:s3:::examplebucket/*"
}
]
}
Please note that some permissions are granted against the bucket (eg ListBucket) while some are granted within the bucket (eg GetBucket).
See: User Policy Examples - Amazon Simple Storage Service