iOS save to camera roll - gluon

Question

I extended the Charm-Down Pictures Service and added a new method that would allow me to save an image in the user's camera roll. So I used information from previous questions to convert the image into a base64 encoded string.
#Override
public void saveImage(Image image) {
PixelReader pixelReader = image.getPixelReader();
int width = (int) image.getWidth();
int height = (int) image.getHeight();
int[] data = new int[width * height];
pixelReader.getPixels(0, 0, width, height, PixelFormat.getIntArgbPreInstance(), data, 0, width);
// 2. int array to byte array
ByteBuffer byteBuffer = ByteBuffer.allocate(data.length * 4);
IntBuffer intBuffer = byteBuffer.asIntBuffer();
intBuffer.put(data);
// 3. Encode to String
String encoded = Base64.getEncoder().encodeToString(arr);
saveImage(encoded);
}
public static native void saveImage(String s);
The native method called Does this :
JNIEXPORT void JNICALL Java_com_gluonhq_charm_down_plugins_ios_IOSPicturesService_saveImage
(JNIEnv *env, jclass jClass, jbyteArray array, jstring jTitle) {
const jchar *charsTitle = (*env)->GetStringChars(env, jTitle, NULL);
NSString *name = [NSString stringWithCharacters:(UniChar *)charsTitle length:(*env)->GetStringLength(env, jTitle)];
(*env)->ReleaseStringChars(env, jTitle, charsTitle);
NSData *data = [[NSData alloc]initWithBase64EncodedString:name options:NSDataBase64DecodingIgnoreUnknownCharacters];
if (data==NULL) {
NSLog(#"data is null");
}
NSLog(#"Saving");
UIImage *ret = [UIImage imageWithData : data];
if (ret==NULL) {
NSLog(#"image is null");
}
[_pictures savePicture: ret];
}
-(void) savePicture : (UIImage *) snapshot {
UIImageWriteToSavedPhotosAlbum(snapshot, nil,nil, nil);
NSLog(#"Saved");
}
I used this code to convert a JavaFx Image into a string and natively turn it back into a UIImage that can be stored in the user's camera roll. However, everytime that I attempt this, the (data==NULL) block gets called because the NSData object appears to be null. Does anyone know why my Base64 encoded string cannot be converted into a NSData object properly?
byte[] arr = byteBuffer.array();
for (int x = 0; x < arr.length; x += 4) {
byte b = arr[x];
arr[x] = arr[x + 1]; //a r
arr[x + 1] = arr[x + 2];//r g
arr[x + 2] = arr[x + 3];//g b
arr[x + 3] = b;//b a
}
I even optionally converted it from argb to Rgba format, but this did not seem to fix the problem