E-S3VS-1

The given S3 Bucket string {{S3_URI}} has an invalid format. Expected format: http(s)://BUCKET.s3.REGION.amazonaws.com/KEY or http(s)://BUCKET.s3.REGION.CUSTOM_ENDPOINT/KEY. Note that the address from the CONNECTION and the source are concatenated.

Change the address in your CONNECTION and the source in your mapping definition.