Multiple file upload, resize and store in different tables.

I'm afraid I don't have any tips there. But it's possible. You can make a Drag and Drop uploader/previewer in Javascript, you don't need to upload them. But I don't know if it's possible to drop one image and later drop five more and not delete them. It should be possible to store them in a variable.

I'm using this design together with Dropzone JS.
https://stackoverflow.com/a/47178466

But I won't them to be automatically uploaded.