As I understand, you want to migrate Microsoft Sql database from on-prem to AWS RDS and you are not sure about the next steps to be followed after uploading the backups to S3 bucket.
Once the upload is done successfully, the next step is to Restore the databases in Amazon RDS for Sql Server. There are certain steps to be followed in order to achieve that. I suggest you to please refer this documentation. It has step-by-step information that will help you in restoring the backup database from S3 to RDS.
This, link might also be helpful to you. If you face any problems or need further assistance while migrating your databases then it would be better to reach out to any DMS engineer of AWS Premium Support.
How to take backup of sql server on Another windows machineasked 3 months ago
Change SQL Server from Bring Your Own License (BYOL) to License Included without migrationAccepted Answerasked 6 years ago
Sizing RDS SQL Server for existing SQL Server running on Windows ServerAccepted Answerasked 3 months ago
Linked server connection from on-prem SQL Server to RDS MySQL?asked 2 months ago
AWS Glue for SQL Server(on-premises) Data Migrationasked 6 months ago
SQL Server RDS migration to EC2 SQL ServerAccepted Answerasked 6 months ago
We have multiple sql server databases on premises and those are setup as clusters, now we have decided to migrate same in RDS, ow how to migrate clustersasked 4 months ago
Data Base Migration from On Prem My SQL Server to AWS RDS using DMSasked 7 months ago
Is it possible and OK to migrate Windows Server 2008 and SQL 2008 R2 as isasked 3 years ago
Migrate SQL Server 2008/2012 to AWSasked a month ago