Add Upload button for OpenAPI 2.0 file as Octet-Stream

Context

• I am using OpenAPI ver 2.0
• I have API which consumes application/octet-stream (Java InputStream)

Issue

In OpenAPI ver 2.0 I can only set input type as multipart/form-data (link) to have upload button. When I have applied this solution for my swagger:
<code>
"consumes": [ "multipart/form-data" ],
"produces": [ "application/json" ],
"parameters": [ {
"in": "formData",
"name": "messageFile",
"description": "Description...",
"required": true,
"type": "file"
} ]

</code>

I am getting following error: Unsupported Media Type after sending a file - it is normal due to my API wants octet-stream.

Question

Is it possible to have upload button using OpenAPI ver 2.0 and application/octet-stream like:

If no, then what will be better solution / workaround for this?