curl -s -X POST http://www.example.com/wp-json/wp/v2/media/ -H "Content-Type: application/json" -H "Content-Disposition: attachment; filename=image.png" -H "Authorization: Basic $base64credentials " -d "{"title":"mymedia", "alt-text":"", "caption":"", "description":"", "slug":"myslug", "status":"publish", "date":"2019-01-16T00:00:00", "post":$id}"

{"code":"rest_upload_sideload_error","message":"Sorry, this file type is not permitted for security reasons.","data":{"status":500}}