Manual publication script for resources

Hi,

I try to configure the manual publication script in the deployment wizard:
 

then I want to use this option to upload images within deliveries. However, it gives me the error: (-53) when I try to upload images.

My assumption is the path for the publication script I provided is incorrect, but I cannot find any documentation that provides the explanation when the script should be put.

As for the script - connector.sh - it moves files to external storage and works fine outside ACC.

Can you give me a hint what should I do to make it working?