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A developer is developing a mobile quiz app hosted on AWS and is using AWS CodeDeploy to deploy the application on a cluster of EC2 instances. A hotfix needs to be applied after the scheduled deployment. These are files not included in the current application revision, so the developer uploaded the files manually to the target instances. On the next application release, the hotfix files were included in the new revision, but the deployment fails, and CodeDeploy auto-rolls back to the previous version. However, it was noticed that the hotfix files that were manually added were missing, and the application was not working properly. Which of the following is the possible cause, and how will it be prevented in the future?