knife4j-spring-boot-starter 3.0.2版本 MultipartFile类型参数UI调试界面显示不显示文件的“上传”按钮

问题如图：
![输入图片说明](https://images.gitee.com/uploads/images/2021/0201/182612_1b920641_1113506.png "屏幕截图.png")
![请求的centent-type应该是form才对的，现调试无法选择上传文件](https://images.gitee.com/uploads/images/2021/0201/182754_7a120df5_1113506.png "屏幕截图.png")
后台代码：
```
  @Operation(summary = "uploads an image", security = {
      @SecurityRequirement(name = "petstore_auth",
          scopes = {
              "write:pets",
              "read:pets"})}, tags = {"pet"})
  @ApiResponses(value = {
      @ApiResponse(responseCode = "200",
          description = "successful operation",
          content = @Content(schema = @Schema(implementation =
              ModelApiResponse.class)))})
  @PostMapping(value = "/pet/{petId}/uploadImage", produces = {"application/json"}, consumes = {
      "application/octet-stream"})
  public ResponseEntity<ModelApiResponse> uploadFile(
      @Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") Long petId,
      @Parameter(description = "Additional Metadata") @RequestParam(value = "additionalMetadata",
          required = false) String additionalMetadata,
      @io.swagger.v3.oas.annotations.parameters.RequestBody(
          content = @Content(mediaType = "application/octet-stream",
              schema =
              @Schema(
                  type = "string",
                  format = "binary"))) @Valid @RequestPart(
          "file") MultipartFile file) {
    return getDelegate().uploadFile(petId, additionalMetadata, file);
  }
```
生成的api-doc如下：

```
{
  "openapi": "3.0.3",
  "info": {
    "title": "test",
    "description": "<div style='font-size:14px;color:red;'>test</div>",
    "termsOfService": "http://www.test.cn",
    "contact": {
      "name": "test",
      "url": "www.test.cn"
    },
    "version": "1.0"
  },
  "servers": [],
  "paths": {
    "/oss/v1/upload": {
      "post": {
        "tags": [
          "oss-storage-controller"
        ],
        "summary": "文件上传",
        "operationId": "uploadUsingPOST",
        "parameters": [
          {
            "name": "title",
            "in": "query",
            "description": "title",
            "required": false,
            "style": "form",
            "schema": {
              "type": "string"
            }
          }
        ],
        "requestBody": {
          "content": {
            "multipart/form-data": {
              "schema": {
                "required": [
                  "file"
                ],
                "type": "object",
                "properties": {
                  "file": {
                    "type": "string",
                    "description": "file",
                    "format": "binary",
                    "name": "file",
                    "in": "query"
                  }
                }
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "OK",
            "content": {
              "*/*": {
                "schema": {
                  "$ref": "#/components/schemas/RestResult"
                }
              }
            }
          },
          "201": {
            "description": "Created"
          },
          "401": {
            "description": "Unauthorized"
          },
          "403": {
            "description": "Forbidden"
          },
          "404": {
            "description": "Not Found"
          }
        }
      }
    }
  },
  "components": {}
}
```
复制到 https://editor.swagger.io/#/ 调试是没有问题的。

GVP 萧明/knife4j

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GVP萧明/knife4j

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