this only handles file:// URLs; I don't think we need to handle http(s):// URLs (?) but I'm not sure about data: URLs: embedded sourcemaps are already part of the recording, so does the backend need these to be uploaded separately?
I tried this with a local backend, but the original sources didn't show up - not sure if separately uploaded sourcemaps should work with a local backend?
file://URLs; I don't think we need to handlehttp(s)://URLs (?) but I'm not sure aboutdata:URLs: embedded sourcemaps are already part of the recording, so does the backend need these to be uploaded separately?