Hi! Amazing discovery!
Thank you for sharing.
I found a similar spider in France, but that one was in a web.
Apparently it's called Cyclosa conica.
It was a few years ago when I was living in the forest, I spent a lot of time observing insects.
The same day I saw that poop-spider I witnessed a pursuit like in a miniature James Bond movie on the carpentry of the outdoor toilets.
What I first thought was a big ant running after a smaller one, changed completely when the first ant fell over the edge of the beam and the big one jumped after it, but secured by a "cable"!! I realised it was not an ant but a spider!! I am not sure but I think it was that one: Myrmarachne formicaria
Fascinating anyway.