title: Flasgger: Parameters not showing and Schema
body: <p>I have recently started learning Swagger for APi documentation. However, when I go to localhost:5000/apidocs, I see APIs that I added but all APIs are with no parameters even when I have described parameters in my yml file. I couldn't find anything relevant on the internet.</p>
  <p>Here is my YML code:</p>
  <pre><code>paths:
    /api/ppp:
      get:
        tags:
        - &quot;user&quot;
        summary: &quot;Find User by uID&quot;
        description: &quot;Returns a single user info&quot;
        operationId: &quot;getuserById&quot;
        produces:
          - &quot;application/xml&quot;
          - &quot;application/json&quot;
        parameters:
          - name: &quot;userId&quot;
            in: &quot;path&quot;
            description: &quot;ID of user to return&quot;
            required: true
            type: &quot;uuid&quot;
  </code></pre>
  <p>and here is how I am adding swagger to the api
  @swag_from('pathto/swagger.yml')</p>
  <p>Similarly, I have another doubt. We define schema in the yml specification file. I want to know what exactly those schema represent and is it necessary to use them?</p>
  <p>Attached is a screenshot of the APIdocs page <a href="https://i.stack.imgur.com/N4esq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/N4esq.png" alt="enter image description here" /></a></p>