I’m genuinely astonish by the post telling how to upload image using base64. Which is great, kind of buggy for old or devices with low memories. But then here it go the title of this post. How?, It’s possible? there some kind of all-wise guru hidden, whom know such secrets?. 
You can try uploading image by accessing it from storage. From what I did, I first get it XMLHttpRequest. Second add it to a FormData then next access the http api to post the image.
Ok, it’s a common use on web develop (and a very convenient way to upload image using XHR, to get the Blob image’s and sending to the server using FormData). You’d use File Native to retrieve the file Blop from storage device?.