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File Security Storage updates patterns and code in your lambda functions. AWS Lambda has a 75GB storage limit. To prevent reaching this limit, File Security Storage now includes an auto-cleanup feature that removes older Lambda versions. You must redeploy your Client Stack to enable this feature as it requires additional IAM permissions,

New permissions

Permission
Purpose
lambda:ListVersionsByFunction
Lists all versions of Lambda functions
lambda:ListAliases
Identifies versions in use (to avoid accidental deletion)
lambda:DeleteFunction
Deletes old versions