File payloads not working (for Linkedin)

I just ran into the problem of uploading image files to the Linkedin API and got the following Exception:

```java.lang.UnsupportedOperationException: JDKHttpClient does not support File payload for the moment```

Is there a new (beta/snapshot) version that works (I used 8.3.3) or an expected time when it might work? 

If not what are the alternatives to upload image files?