When trying to import a workflow, the following error is returned:
Import workflow invalid file format: The workflow file is not a valid zip file.
The zip file it seems okay, and nothing obvious is wrong with the workflow itself.
All versions of xMatters
This can happen if a deleted form is referenced in an integration, resulting in an incomplete integration that cannot be imported. To resolve this, check for invalid references or validation errors.
An exported integration may be invalid.