Plugin should be able match branches between two repositories. If remote-file plugin SCM source has the same branch name with in the project configuration, plugin should run the Jenkins file in the branch in remote-file plugin SCM source with same name. If there is no branch name matching the main SCM, It should fall back the master version
For example
master branch on main SCM -> master branch on Plugin SCM
test branch on main SCM -> tes tbranch on Plugin SCM