FilzaEscaped, the file manager of choice among iOS 11 jailbreakers contains a bug which doesn't allow you to extract archives on the device. This makes installing tweaks annoying as you need to SSH into your iDevice using a Mac or a PC. That's far from perfect.
Thankfully, there is now a way to install tweaks right from your device by using a combination of different tools by different developers. It sounds complicated, however, it is very simple and this video shows you exactly how to do it. Enjoy!