How to upload files in flex using PyAMF or PhpAMF? client side, and very little server side help needed.

Question

Hy!

1. I need to upload a group of images using flex with robotlegs.
2. I need a progress bar to work when image is uploading.
3. It might upload 1 image or more at the time.
4. I want to know if uploading byteArray to server and then save the image is too heavy for the server.
5. In the server side I have a method that is made by pyamf, and looks like this:

.

def upload_image(input):
    # here does stuff. I need to be able to get parametters like this
    input.list_key
    # and here I need some help on how to save the file

Thanks ;)