first of all, thanks a lot for doing this project, i'm forever grateful for the value you added to my life for free, I have been using it without issues for the past year.
I have the Exynos i9500.
in twrp /sdcard/ seems to be wiped.
I have no choice now other than to download latest to PC, move it to from twrp and install again,
I hope this was just caused by substratum the theming engine that I granted root and file system access.
by the way, are you planning to work on the Oreo version too? I would want to contribute, I'm very interested in the Linux kernel and Android, but I have no experience, also in programming with C and C++.