Error importing an unmanaged solution from a different tenant

[Digital]

I'm determined to start using solutions to package up my apps, flows and environment variables but not having much success when exporting to a different tenant. I receive an error saying Unprocessed files found but don't know what this means. My environment variables are connections to a SharePoint site and lists.

I've tried exporting as managed and unmanaged. The new environment has the site with the same lists which I select in the destination environment before import. 

Message

Unprocessed files found: /environmentvariabledefinitions/new_InspectionAnswers/environmentvariablevalues.json, /environmentvariabledefinitions/new_InspectionAudio/environmentvariablevalues.json, /environmentvariabledefinitions/new_InspectionChoices/environmentvariablevalues.json, /environmentvariabledefinitions/new_inspectionDocument/environmentvariablevalues.json, /environmentvariabledefinitions/new_InspectionPhotos/environmentvariablevalues.json, /environmentvariabledefinitions/new_InspectionQuestions/environmentvariablevalues.json, /environmentvariabledefinitions/new_Inspections/environmentvariablevalues.json

Example environment variable definition:

<environmentvariabledefinition schemaname="new_InspectionAnswers">
  <apiid>/providers/microsoft.powerapps/apis/shared_sharepointonline</apiid>
  <defaultvalue>7af64f01-c713-4996-8e16-2295e2ccdbf0</defaultvalue>
  <displayname default="inspectionAnswers">
    <label description="inspectionAnswers" languagecode="1033" />
  </displayname>
  <introducedversion>1.0.0.0</introducedversion>
  <iscustomizable>1</iscustomizable>
  <isrequired>0</isrequired>
  <parameterkey>table</parameterkey>
  <parentdefinitionid>
    <schemaname>new_Inspections</schemaname>
  </parentdefinitionid>
  <secretstore>0</secretstore>
  <type>100000004</type>
</environmentvariabledefinition>

{
  "environmentvariablevalues": {
    "environmentvariablevalue": {
      "@environmentvariablevalueid": "33e13b2f-1795-ec11-b400-002248926484",
      "iscustomizable": "1",
      "value": "7af64f01-c713-4996-8e16-2295e2ccdbf0"
    }
  }
}