Can't see multiple authors

Hi guys, I’ve edited some (academic) books metadata with Calibre and within the app I can see all the authors perfectly, but when I transfer them to my Kindle with the Send to Kindle app if a book has multiple authors I can only see one, precisely the first one, about the others nothing to do.

I use the ampersand syntax like: Name1 Surname1&Name2 Surname 2 etc.

Its correct or I’m getting something wrong? Thank you :thumbsup:

device: Kindle Paperwhite 2013 - Firmware 5.12.2
programs: Calibre v4.16.0 - Send to Kindle v1.1.1.250 - Windows 10