title: Is it possible to trigger Multibranch pipeline job from a regular Jenkins job under "Build other Projects"?
body: <p>I have 2 jobs. One is a regular freestyle job on Jenkins that is supposed to trigger another job which is a Multibranch pipeline job.</p>
  
  <p>The issue is whenever I enter the name of the Multibranch job in the "Projects to Build column", I get an error - "x is not buildable". But the Multibranch job works perfectly well on its own and there are no problems with it.</p>
  
  <p>Is "Build other projects" post build action (downstream project) not compatible with Jenkins pipelines? What am I missing here?</p>