[TIMOB-26370] Android: "Failed to create external storage directory" when download image and save to camera roll

var checkCameraPermissions = function(callback) {
    if (Ti.Media.hasCameraPermissions()) {
        Ti.UI.createAlertDialog({ cancel: 0, buttonNames: ['OK'], title:'Permissions', message:'Already had permissions. Good to go.'}).show();
        callback(true);
    } else { 
        Ti.Media.requestCameraPermissions(function(e) {
             if (e.success === true) {
                 Ti.UI.createAlertDialog({ cancel: 0, buttonNames: ['OK'], title:'Permissions', message:'User granted permissions. Good to go.'}).show();
                 callback(true);
             } else {
                 Ti.UI.createAlertDialog({ cancel: 0, buttonNames: ['OK'], title:'Permissions', message:'User did not granted permissions. Bad day.'}).show();
                 callback(false);
             }
        });
    }
};
  
var win = Ti.UI.createWindow({
    exitOnClose: true,
    fullscreen: false,
    title: 'Test'
});

var button = Titanium.UI.createButton({
    title: 'Test DL Img & Save to Camera Roll'
});   
button.addEventListener('click', function(e) {
    checkCameraPermissions(function(returnedData) {            
        if (returnedData == true) {
            var xhrImageGet = Ti.Network.createHTTPClient({
                onerror : function(xhrErr) {
                    Ti.UI.createAlertDialog({ cancel: 0, buttonNames: ['OK'], title:'Error', message:'Unable to download the remote image. ' + xhrErr.error}).show();
                },
                onload : function() {
                    try {
                        var image_to_save = this.responseData;                    
                        var picture = Titanium.Filesystem.getFile(Titanium.Filesystem.tempDirectory, 'icon-arrowFeature.png');
                        picture.write(image_to_save);                                                        
                        Ti.Media.saveToPhotoGallery(picture.read(), {
                            success:function(){
                                Ti.UI.createAlertDialog({ cancel: 0, buttonNames: ['OK'], title:'Image Saved', message:'icon-arrowFeature.png has been saved to your photo gallery.'}).show();
                            },
                            error:function(err){
                                Ti.UI.createAlertDialog({ cancel: 0, buttonNames: ['OK'], title:'Error Saving to Gallery', message:err.error}).show();
// FAILS RIGHT HERE WITH NO ERROR MESSAGE RETURNED. HOWEVER CONSOLE SHOWS THE ERROR TiMedia: (main) [526999,526999] Failed to create external storage directory.
                            }
                        });                        
                        image_to_save = null;
                    }
                    catch(saveErr) {
                        Ti.UI.createAlertDialog({ cancel: 0, buttonNames: ['OK'], title:'Error', message:'Unable to save the file to your device. ' + saveErr.error}).show();
                    }
                }
            });                                        
            xhrImageGet.open("GET", 'https://s3.amazonaws.com/www.appcelerator.com.images/icon-arrowFeature.png');
            xhrImageGet.send();                                            
        } else {
            Ti.UI.createAlertDialog({ cancel: 0, buttonNames: ['OK'], title:'Permission Not Granted', message:'You have not granted the app the needed permissions to access your camera and/or device storage.'}).show();
        }        
    });                                            
});

win.add(button);        
win.open();

<?xml version="1.0" encoding="UTF-8"?>
<ti:app xmlns:ti="http://ti.appcelerator.org">
    <id>com.walkthelot.testsavetogallery</id>
    <name>TestSaveToGallery</name>
    <version>1.0</version>
    <publisher>Ken</publisher>
    <url/>
    <description>undefined</description>
    <copyright>2018 by Ken</copyright>
    <icon>appicon.png</icon>
    <fullscreen>false</fullscreen>
    <navbar-hidden>false</navbar-hidden>
    <analytics>true</analytics>
    <guid>a17321c0-c4e2-4542-9222-e3f5731f8fb5</guid>
    <property name="ti.ui.defaultunit" type="string">dp</property>
    <property name="run-on-main-thread" type="bool">true</property>
    <android xmlns:android="http://schemas.android.com/apk/res/android">
        <manifest android:installLocation="auto">
            <uses-permission android:name="android.permission.WAKE_LOCK"/>
            <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
            <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
            <uses-permission android:name="android.permission.INTERNET"/>
            <uses-permission android:name="android.permission.VIBRATE"/>
            <uses-permission android:name="android.permission.WRITE_MEDIA_STORAGE"/>
            <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
            <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
            <uses-permission android:name="android.permission.CAMERA"/>
            <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="26"/>
        </manifest>
    </android>
    <modules/>
    <deployment-targets>
        <target device="android">true</target>
        <target device="ipad">false</target>
        <target device="iphone">false</target>
    </deployment-targets>
    <sdk-version>7.3.1.GA</sdk-version>
</ti:app>