I recently started using Jellyfin, and it does not recognize multiple artists if the delimiter in the tag is "\". I am trying to replace all double backslashes in the artists tag with semi-colons, which Jellyfin does recognize.
I found this helpful convert tag-tag code in the forums that replaces a semicolon with backlashes.
So I changed it to:
But this does not replace the delimiter, and instead just erases all artists after the first one.
I have also tried the replace function with similar results. It doesn't seem like MP3tag, at least how I'm using it, is willing to replace the backslash delimiter with anything else.