Support the POST of multipart/form-data natively
Multipart/form-data is defined in RFC 1867 - this isn't yet supported in https://docs.microsoft.com/en-us/azure/logic-apps/logic-apps-content-type - albeit this can done manually, by setting the headers, etc.
David Burg commented
For HTTP POST request, you can do a multipart payload as shown in the documentation:
Also as a 3rd party example for trigger:
can you please explain how is this done. I am getting an error when using multipart form by defining headers