Hey maker community,
I’m stuck on an issue and I can’t find any useful hints. My custom build app which looks like below is just throwing “source.on is not a function” and stops carrying out the request. (screenshot below as well)
I already figured out that "type": "multipart/form-data" is causing the problem. No further hints than “source.on is not a function” is given by make. The exact same request works in Postman.
I’m running out of ideas. 
[
{
"url": "/sync/importmodel",
"method": "POST",
"type": "multipart/form-data",
"qs": {},
"body": {
"data": {
"dataModelType": "{{parameters.dataModelType}}",
"account": "{{parameters.account}}",
"title":"{{parameters.title}}",
"options": {
"skipPreview": "{{parameters.skipPreview}}",
"updateExisting": "{{parameters.updateExisting}}",
"useOEMAccount": "{{parameters.useOEMAccount}}",
"createMissingAssetTypes": "{{parameters.createMissingAssetTypes}}",
"useCustomerLocation": "{{parameters.useCustomerLocation}}"
}
},
"files": {
"value": "{{parameters.file_data}}",
"options": {
"filename": "{{parameters.file_name}}"
}
}
}
}
]
