Problem to upload image from Angular to php

I'm trying to upload an image from an angular application with php backend, but the file arrive as null to backend.

fileUploaded(event) { // called each time file input changes
    let fileList: FileList = event.target.files;
    if (fileList && fileList[0]) {
      let file: File = fileList[0];
      var reader = new FileReader();
      reader.readAsDataURL(fileList[0]); // read file as data url
      this.format.File = file;
      reader.onload = (ev) => { // called once readAsDataURL is completed
        this.format.Picture = ev.target['result'];
      }
    }  
  }

This is the caller to the service

createFormat(){
    this.format.Label = this.format.Name;
    const formData = new FormData();
    formData.append('formatLogo', this.format.File);
    this.formatService.uploadLogo(formData).subscribe()
  }

this is the service. I tried to use Content-Type also, with the same result

uploadLogo(formData){

    let headers = new HttpHeaders();
    headers.append('enctype', 'multipart/form-data');
    headers.append('Accept', 'application/json');
    let options = { headers: headers }
    return this.http.post(this.formatsPath + '/uploadLogo', formData, options);
  }

This is the request payload

------WebKitFormBoundaryUlyYDb5WjslMf3nw
Content-Disposition: form-data; name="formatLogo"; filename="fileName.jpg"
Content-Type: image/jpeg


------WebKitFormBoundaryUlyYDb5WjslMf3nw--

This is the server side

    function uploadLogo(){
        $name = $_FILES['formatLogo']['name'];
--code--
    }

The server side, obviosly, have more things to do. But the simple file is empty, so it's not useful to post everything.

I can't get the mistake. :'(

Someone smarter than me can provide his help? Please