Extend the "Web request"-action for additional content-type header parameters
Please extend the input fields for "other method" in "Web Request"-Workflow action by the content-type-parameter which is also available on the other methods like PUT or POST. Without this parameter set there are external webservices which will fail like them in Microsoft Graph.

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Corey commented
Adding further comments: Not being able to specify a Content-Type header means we are stuck with only being able to use the MIME Type: 'application/octet-stream'.
Trying to specify the Content-Type when selecting Method: Other returns the following error:
"The 'Content-Type' header must be modified using the appropriate property or method.Parameter name: name"