Facebook Module dialog error picture is not formatted properly

How do you include a picture in Titanium's Facebook Module dialog? In Titanium's example, the picture property in the dialog is a link of a picture from a website:

var data = {
    link : "http://www.appcelerator.com",
    name : "Appcelerator Titanium Mobile",
    message : "Checkout this cool open source project for creating mobile apps",
    caption : "Appcelerator Titanium Mobile",
    picture : "http://developer.appcelerator.com/assets/img/DEV_titmobile_image.png",
    description : "You've got the ideas, now you've got the power. Titanium translates " +
                  "your hard won web skills into native applications..."
};
fb.dialog("feed", data, function(e) {
    if(e.success && e.result) {
        alert("Success! New Post ID: " + e.result);
    } else {
        if(e.error) {
            alert(e.error);
        } else {
            alert("User canceled dialog.");
        }
    }
});

But what if you want to use a picture that's local and NOT via a link of a website like this?

var data = {
    link: "http://play.google.com/",
    name: "Android app's name",
    picture: "file:///data/data/com.appid/app_appdata/directory/name-of-image.jpg"
};

I get the picture property formatting error if I use the code above. See this image for visual reference: http://postimg.org/image/wjefdlalb/

I've tried using the FileSystem like this:

function getFile() {
var imageFileToPost;
var imageFile = Ti.Filesystem.getFile("file:///data/data/com.appid/app_appdata/directory/name-of-image.jpg");
    if (imageFile.exists()) {
        console.log("exists");
        imageFileToPost = imageFile.read();
    }
return imageFileToPost;
}
var data = {
    link: "http://play.google.com/",
    name: "Android app's name",
    picture: getFile() 
};

And the post is successful, there are no errors BUT the picture was NOT published on Facebook.

Note: I would use the graph but I need to use permissions like 'publish_actions' which means I have to to have Facebook review the app but they don't like prefill messages even when the user can edit message anyways.

So is this really just a formatting issue with Facebook Module's dialog or it only takes URLs of a picture? If it's a formatting issue, can anyone tell me how to format this correctly because I really need to use the picture that's local and not from a website?