S3 connection to Snowflake

Hi,

I've been trying to connect s3 to Snowflake using storage integration, however, there is a policy in the s3 about the user that I cannot see how to modify to give access to the Snowflake user to alter this bucket. I followed the next configuration https://snowflakewiki.medium.com/connecting-snowflake-to-aws-ef7b6de1d6aa and it worked when no policy exists in the S3 bucket. However, I would like to ask how to add user access to the bucket to accept the Snowflake user because I'm getting this error from Snowflake when I try to create an external table:

Failure using stage area. Cause: [Access Denied (Status Code: 403; Error Code: AccessDenied)]