Because sometimes the mobile snapshot pictures are rotated and it showed upside down, I had to process the image in my back end considering is a lot of work to fix this in front end. So I've try to replace the url key with my thumbnail url that I get it from my back end but nothing change it as preview, the base64 encoded image is still there. So how can I display my thumbnail, after upload.
Thanks again and thanks for your valuable time - I've noticed that you reply very fast, which is great for all of us that we are using your work