Hi there,
The new 4.8.3.0 version has changed its old method to store person metadata as .nfo files (previously stored in emby-server/metadata/people/... along with person's images, now there are only images, I don't find any person's NFOs anywhere). I have ticked the "Enable reading and writing of person metadata files" option in "Library-Advanced" page, and try to upload an NFO file into "people/x/xx" path myself, and by refreshing metadata, sometimes the info for this person could be upd