I am having the same problem with version 1.20.0. I am using the advanced properties from "UpdateAttribute" to set up the attribute name to: s3_bucket #{s3_my_bucket} and then using it on my next processor: s3_buc: ${s3_bucket:evaluateELString()} And is not working, the value that I am getting is: s3_buc Empty string set This functionality used to work in prev. versions. Thanks   ... View more