Really cool project, even though it has its flaws. Be prepared to search the documentation and update the configuration via the command line, as there’s no settings page in the web interface.
I had some trouble with it throwing a fatal error on URLs longer than the max filename length on my filesystem, but the author has been very responsive on GitHub. I replied to a 3-4 year old closed issue and the author opened it again and tried implementing a new fix in the dev version. I’m encountering another issue with using the dev version in my setup right now, but I think that’s being worked on.
How about presenting the actual photo editing features instead of telling potential new users about the QT framework and C++ or whatever it uses? The website is peak “programmer attempting marketing”.