@ccc I've not been able to get the script working. This is the end of the traceback:
with open(src, 'rb') as fsrc:
IsADirectoryError: [Errno 21] Is a directory: '/var/mobile/Containers/Shared/AppGroup/379D48B7-C511-4AF4-80DD-2A91B9CD9D2A/File Provider Storage/Pythonista-and-Working-Copy'
I'm not an experienced Pythonista user though, so I might have installed the script incorrectly. I added it as a URL extension, is that correct? Do we need to put anything in the Arguments field in the Pythonista extension editor? Could someone describe the correct way to install the script?