Atlas - blocks.json

Hi people, I used to have a array of type:single sources in my blocks.json atlas file, but I'm now trying to just include the whole texture directory under my namespace. Yet, my json seems not to work. { "sources": [ { "type": "directory", "source": "ulg:custom", "prefix": "ulg:custom/" } ] } nor { "sources": [ { "type": "directory", "source": "ulg", "prefix": "ulg:" } ] } (wild attempt) work. From my console I get the Invalid path textures/ulg:custom Invalid segment 'ulg:custom' in path 'textures/ulg:custom' So what's the way to indicate my custom namespace as path? pls help 🙂