Hi Piotr

You can create a symbolic link using the macOS terminal. So navigate into the SERP folder and execute the command below. Replace path to external drive with the correct path to your external drive.

sudo ln -s /path/to/externaldrive Attach

This means that Attach folder is simply a link that points to the external drive where the actual files will be stored.

I would like to thanks someone, but I don't know whom... :-)