in "S3 Copy Artifact"

1. enter a project name in field [Project name] and it works and successfully copy artifact as expected
2. enter variable name in variable $PROJECT_TO_COPY, which is passed from input choice parameter (in exact same value as 1.) yet encounter error, as below:

Unable to find project for artifact copy: isonosw.master.allrelease/isonosw.master.linux.xilinx
This may be due to incorrect project name or permission settings; see help for project name in job configuration.
Build step 'S3 Copy Artifact' changed build result to FAILURE

It is ruled out the "incorrect project name" and "incorrect permission settings" as the exact same name used in plugin field [Project name], only difference is "Specifying statically" and "Specifying dynamically"