Tree Schema will assume the role of a user in order to access S3. The access to the role should be scoped to only the buckets and items that you want Tree Schema to have access to. Tree Schema will only require list and read access and will never execute any write commands.
The following fields are required for S3:
Access Key ID
Access Key Secret
S3 connects directly to AWS using HTTPs and is not eligible to connect through a jump server.