For a twitter post you may provide text, URL and a picture as Texture2D. See the method description below:

ISN_Twitter.Post("My app Screenshot", "htpp://", screenshot);

You may also subscribe to a competition event to find out if a user has posted to Twitter. See the code snippet below:

public void ShareTwitter() {
    ISN_Twitter.Post("My app Screenshot", "htpp://", screenshot, HandleOnTwitterPostResult);

void HandleOnTwitterPostResult(SA_Result result) {
    if(result.IsSucceeded) {
        Debug.Log("Post Success!");
    } else {
        Debug.Log("Post Failed!");

You can also post gif image to the twitter feed providing gif image device path.

ISN_Twitter.PostGif("My Gif", "gif file path");

Please, note that posting process will run in background and may take a while. The same OnPostResult action will be fired once a post request is completed.