Import pbix using Flow

Greetings all, thank you in advance for reading this and more so if you can assist!  

I am attempting to use Flow to retrieve a .pbix file from a bitbucket repository and import it to a workspace.     To simplify the problem I've created this flow to illustrate the issue, simply pulling the .pbix from Sharepoint:

I'm nearly there but am getting an error from PBI Service when posting to the workspace.  When I search for this error I get zero hits.  Makes me feel lonely ;-) 

{
  "error": {
    "code": "MultiPartMimeStreamFormatException",
    "pbi.error": {
      "code": "MultiPartMimeStreamFormatException",
      "parameters": {},
      "details": [],
      "exceptionCulprit": 1
    }
  }
}

Any guidance is much appreciated, thanks!