cordovaでcordova-plugin-file-transferを使って、
写真をサーバーへアップロードるするAndroidアプリを作成しています。

わたくしの後述のコードでは、下記のconsole logが出力されます。

Successful file write...
fileURL : file:///data/data/com.adobe.phonegap.app/cache/.Pic.jpg%3F1530809009472
Successful upload...
fileEntry.fullPath = /.Pic.jpg?1530809009472
Code = 200
response = 
bytesSent = 0

このログより、Androidからサーバーへのアクセスは成功しているようですが、
ファイルの転送が0バイト、つまり転送されていないようです。

また、サーバー側では、ファイルは保存されていますが
サイズが0バイトとなっていました。

どなたか、解決策が分かる方、ご回答よろしくお願い致します。

また、他に必要な情報がありましたら、ご指摘お願い致します。

バージョン：

Phonegap Buiid : 7.1.0
Android : 5.0.1
cordova-plugin-file : 6.0.1
cordova-plugin-file-transfer : 1.7.1

ソースコード：

//select and upload picture
$(document).on("click", ".pic-button", function() {
    openFilePicker();
});

function openFilePicker(selection) {
    var srcType = Camera.PictureSourceType.SAVEDPHOTOALBUM;
    var options = setOptions(srcType);

    if (selection == "picker-thmb") {
        // To downscale a selected image,
        // Camera.EncodingType (e.g., JPEG) must match the selected image type.
        options.targetHeight = 100;
        options.targetWidth = 100;
    }

    navigator.camera.getPicture(function cameraSuccess(imageUri) {

        // Do something with image
        console.log("get picture");
        console.log("imageUri : "+imageUri);

        image_uri = imageUri;
        URItoFileEntry(imageUri);
        onUploadFile(imageUri);

    }, function cameraError(error) {
        //console.debug("Unable to obtain picture: " + error, "app");
        console.log("Unable to obtain picture: " + error, "app");

    }, options);
}

function setOptions(srcType) {
    var options = {
        // Some common settings are 20, 50, and 100
        quality: 50,
        destinationType: Camera.DestinationType.FILE_URI,
        // In this app, dynamically set the picture source, Camera or photo gallery
        sourceType: srcType,
        encodingType: Camera.EncodingType.JPEG,
        mediaType: Camera.MediaType.PICTURE,
        allowEdit: true,
        correctOrientation: true  //Corrects Android orientation quirks
    }
    return options;
}

function URItoFileEntry(imageURI) {
    console.log("URItoFileEntry");
    window.resolveLocalFileSystemURL(imageURI, fileEntryToArrayBuffer, onError);
}

function fileEntryToArrayBuffer(fileEntry) {
    console.log("fileEntryToArrayBuffer");
    console.log(fileEntry.name);

    file_entry_name = image_uri.substr(image_uri.lastIndexOf('/') + 1);


    fileEntry.file( function(file) {
        console.log("fileEntry.file");

        var reader = new FileReader();

        reader.onloadend = ArrayBufferToBlob;

        reader.readAsArrayBuffer(file);

    }, onError2);
}

function ArrayBufferToBlob(event) {
    console.log("ArrayBufferToBlob");

    blob = new Blob([event.target.result], { type: "image/jpeg" });

    console.log("blob.size : "+blob.size);
    console.log("blob.type : "+blob.type);
}

function onError() {
    console.log("onError");
}

function onError2() {
    console.log("onError2");
}


function onUploadFile(imageUri) {
    console.log("onUploadFile");
    console.log("imageUri : "+imageUri);

    window.requestFileSystem(window.TEMPORARY, 5 * 1024 * 1024, function (fs) {

        console.log('file system open: ' + fs.name);
        var dirEntry = fs.root;

        console.log("imageUri : "+imageUri);

        dirEntry.getFile(imageUri, { create: true, exclusive: false }, function (fileEntry) {

            console.log("fileEntry name");
            console.log(fileEntry.name);

            // Write something to the file before uploading it.
            console.log("writeFile");
            writeFile(fileEntry);

        }, onErrorCreateFile);

    }, onErrorLoadFs);

    console.log("onUploadFile end");
}

function writeFile(fileEntry, dataObj) {
    // Create a FileWriter object for our FileEntry (log.txt).
    fileEntry.createWriter(function (fileWriter) {

        fileWriter.onwriteend = function () {
            console.log("Successful file write...");

            upload(fileEntry);
        };

        fileWriter.onerror = function (e) {
            console.log("Failed file write: " + e.toString());
            console.log(e.toString());
        };

        if (!dataObj) {
            if(blob == undefined) {
                console.log("blob undefined");
            } else {
                console.log("blob defined");

                dataObj = blob;
            }
        }

        fileWriter.write(dataObj);
    }, failCreateWriter);
}

function failCreateWriter(error) {
    console.log(error.code);
}

function upload(fileEntry) {
    // !! Assumes variable fileURL contains a valid URL to a text file on the device,
    var fileURL = fileEntry.toURL();

    var success = function (r) {
        console.log("Successful upload...");
        console.log("fileEntry.fullPath = " + fileEntry.fullPath);
        console.log("Code = " + r.responseCode);
        console.log("response = " + r.response);
        console.log("bytesSent = " + r.bytesSent);
    }

    var fail = function (error) {
        ons.notification.alert("An error has occurred: Code = " + error.code);
    }

    function displayFileData(data){
        console.log("displayFileData");
        //ons.notification.alert(data);
    }

    var options = new FileUploadOptions();
    options.chunkedMode = false;
    options.fileKey = "file";
    options.fileName = file_entry_name;
    options.mimeType = "image/jpeg";

    var params = {};
    params.value1 = "test";
    params.value2 = "param";

    options.params = params;

    console.log("fileURL : "+fileURL);

    var ft = new FileTransfer();
    // SERVER must be a URL that can handle the request, like
    // http://some.server.com/upload.php
    var url_post_image = "http://some.server.com/upload.php";
    ft.upload(fileURL, encodeURI(url_post_image), success, fail, options);
};

function onErrorLoadFs() {
    console.log("onErrorLoadFs");
}

function onErrorCreateFile() {
    console.log("onErrorCreateFile");
}