Sending multiple files from axios to nestjs (Multipart: Boundary not found)

I’m attempting to send multiple files in a multipart/form-data. This form will have one required file imagem and on required data which will be a json. I has a optional anexos which is an array of images. I’m gettings an error when attempting to send only an image from axios to my nestjs backed.

From the app side I receive:

{"error": "Bad Request", "message": "Multipart: Boundary not found", "statusCode": 400}

If I remove multipart/form-data, I get an error in nestjs:

[Nest] 29165  - 01/21/2025, 10:34:06 AM   ERROR [ExceptionsHandler] Cannot read properties of undefined (reading 'imagem')
TypeError: Cannot read properties of undefined (reading 'imagem')
    at ReceitasController.create

React Native axios logic:

static async create(file: any, receita: Receita): Promise<Receita> {
    const formData = new FormData()

    formData.append('imagem', {
      type: file.mime,
      name: file.fileName,
      uri:
        Platform.OS === 'android' ? file.uri : file.uri.replace('file://', ''),
    })

    formData.append('data', JSON.stringify(receita))

    return http.post('/receitas', formData, {
      headers: { 'Content-Type': 'multipart/form-data' },
    })
  }

Nest.js:

@Post()
@UseInterceptors(
  FileFieldsInterceptor([
    { name: 'imagem', maxCount: 1 },
    { name: 'anexos', maxCount: 5 },
  ]),
)
async create(
  @UploadedFiles()
  files: { imagem: Express.Multer.File[]; anexos?: Express.Multer.File[] },
  @Body() body: { data: string },
  @CurrentUser() user: TokenPayload,
) {
  const file = files.imagem[0]

  const b = JSON.parse(body.data)

  const rc = createReceitaSchema.parse(b)

  return await this.receitasService.create(
    file,
    rc,
    user.sub,
    files.anexos,
  )
}

The http is:

const http = axios.create({
  baseURL: 'http://192.168.1.45:3333/',
  withCredentials: true,
}) as APIInstaceProps

This works fine on my postman: