You can upload a JSON or YAML file that contains your API specification, you can find more info here.
Exemplary json file:
{
"title": "Sample Pet Store App",
"description": "This is a sample server for a pet store.",
"termsOfService": "http://example.com/terms/",
"contact": {
"name": "API Support",
"url": "http://www.example.com/support",
"email": "[email protected]"
},
"license": {
"name": "Apache 2.0",
"url": "https://www.apache.org/licenses/LICENSE-2.0.html"
},
"version": "1.0.1"
}