How do I Load image into Sprite, then SAVE Sprite to Host Server?

Here is an experiment CAPX project that I am working on to learn how to to

Load an image from a user's local PC into a sprite, then, SAVE that Sprite image

to my HOST website server.

I can easily LOAD the image into the sprite from the local PC, however, I am having

trouble SAVING that sprite image to my HOST website server.

https://drive.google.com/file/d/1aLPXrcBScKknHnpAlWyOVUc9tOKGIISd/view?usp=sharing