active choice and file parameters

[Thomas Reifferscheid]

Hi,

 I like to use AC Reactive Reference Parameter and dynamically render 3 file input parameters, load the select files and pass them as base64 encoded strings. 

No matter what I do I always end up with empty variables inside the Jenkinsfile. 

https://issues.jenkins.io/browse/JENKINS-38893 gives some ideas however I fail to get it working.

Appreciate when someone can provide explicit steps or code.

Thank you

Thomas