WebFlux Multipart File Upload - not possible to use FilePart in Swagger Version: 3.23.11

For an endpoint using Spring WebFlux to upload a file, the Swagger UI documentation is not generating properly the File Input Button. It doesn’t allow to choose a file and send it as a multipart request for FilePart:

Controller

public String upload(
@RequestPart(value = "uploadedBy", required = true) String uploadedBy,
@RequestPart(value = "file",required = false) FilePart file)
{
   .....
}

Swagger Version: 3.23.11 Below are the Swagger Maven dependencies.

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-webflux</artifactId>
    </dependency>
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger2</artifactId>
        <version>3.0.0-SNAPSHOT</version>
    </dependency>
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger-ui</artifactId>
        <version>3.0.0-SNAPSHOT</version>
    </dependency>
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-bean-validators</artifactId>
        <version>3.0.0-SNAPSHOT</version>
    </dependency>
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-spring-webflux</artifactId>
        <version>3.0.0-SNAPSHOT</version>
    </dependency>

API Doc Json :

"paths": {
        "/upload": {
            "post": {
                "tags": [
                    "document-controller"
                ],
                "summary": "uploadDocument",
                "operationId": "uploadDocumentUsingPOST",
                "consumes": [
                    "multipart/form-data"
                ],
                "produces": [
                    "*/*"
                ],
                "parameters": [
                    {
                        "in": "formData",
                        "name": "file",
                        "description": "file",
                        "required": false,
                        "schema": {
                            "$ref": "#/definitions/FilePart"
                        }
                    },
                    {
                        "name": "uploadedBy",
                        "in": "formData",
                        "description": "uploadedBy",
                        "required": true,
                        "type": "string"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK"
                    },
                    "201": {
                        "description": "Created"
                    },
                    "401": {
                        "description": "Unauthorized"
                    },
                    "403": {
                        "description": "Forbidden"
                    },
                    "404": {
                        "description": "Not Found"
                    }
                },
                "deprecated": false
            }
        }
    }

[sylvain-rouquette]

in the meantime, you can do this:

    @ApiImplicitParams({
            @ApiImplicitParam(name = "file1", dataType = "__file", paramType="form", required = true),
            @ApiImplicitParam(name = "file2", dataType = "__file", paramType="form", required = true)
    })

[philipplewe]

Had the same issue and followed this guide: https://stackoverflow.com/questions/63275134/springfox-swagger-ui-3-0-0-does-not-bring-up-swagger-ui-html-page

@RequestPart(“file”) instead of @RequestParam(“file”) did the trick.