OK, since this is obviously such a hidden feature for many on new skin, here I go. This is based on android TV with just a remote so that middle crosshair button is used. Find out the equivalent for your device.
first scroll down to addons….
…and press
you’ll see this…
go to top left icon…
…and press
you’ll see this….
the rest is obvious
and you’ll end up with something like this…
…and browse your zip
EDIT: I know that there is skins subforum but I think that ATM this fits here better since I explaind this a few times here already in the last couple of days. But fell free to move it.