ok, i got the problem, it isn't really related to spaces or local vs remote. It is the presence of characters like ! . Indeed the artifacts on GCS are created converting ! to %21 and are tracked succesfully like this on the server. When the request is sent to actually download the artifacts or to see pictures in Debug samples the %21 is converted back to ! and there is no such object in GCS with ! . Hope it's clear. Not a big deal to me, can just avoid special characters. 🎉