Upload Image From Clipboard

Hello. I want to add the functionality to upload an image from the clipboard. I have tried something like this:

Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
                 
try {
   BufferedImage image = 
                (BufferedImage)clipboard.getData(DataFlavor.imageFlavor);                     
}    
catch(UnsupportedFlavorException ufe) {
    ufe.printStackTrace();
}        
catch(IOException ioe) {
    ioe.printStackTrace();
}

However, this code only works in the local machine. I want to click a button and then, the clipboard's image will be uploaded to the server.

Thank you.