Sort field after images upload

Hi
I wonder how to set the ‘Sort’ field on image’s metadata.txt file after an images batch upload?
Currently, I have to manually reorder them for the field ‘Sort’ being written.
Thanks for any hint
K

According to what sort of criteria would you want to set the number of the sort field?

Edit: If the images are uploaded via the panel, you could use a panel hook (panel.file.upload).

That would based on their filename as the client followed a simple file naming scheme ( ascending figures ).
Okay for the panel hook, will try something simple.
Thanks