A path layer isn’t much of a layer - no points are stored in the room file.
I can potentially add path reloading in future - this doesn’t sound too bad, but there currently is a lot going on with Ukraine so it might take some time.
As a workaround, you can try disabling file system sandbox, loading the path YY file from project directory with a function like this
function file_get_contents(s) {
var b = buffer_load(s);
if (buffer_get_size(b) == 0) return "";
var r = buffer_read(b, buffer_string);
buffer_delete(b);
return r;
}
and then parsing the contents with json_parse
and re-populating path points using the various path_
functions.