No support for UTF-8 slug

Can you give us an URL sample so we can test?

Yes here you go

https://fellachidis.gr/product/%CE%B6%CE%B1%CE%BC%CF%80%CE%BF%CE%BD%CE%BF%CF%84%CF%85%CF%81%CE%BF%CF%80%CE%B9%CF%84%CE%B1-%CF%83%CF%86%CE%BF%CE%BB%CE%B9%CE%B1%CF%84%CE%B1-%CE%BC%CE%B5-%CF%83%CE%B1%CE%BB%CF%84%CF%83%CE%B1/

When I paste this url in the redirection it transforms into a non working url

Well, that URL does seem to be broken, so you might want to check it. When decoded it opens https://fellachidis.gr/product/ζαμπονοτυροπιτα-σφολιατα-με-σαλτσα/

The URL is not broken. It is a slug that used to exist, but then we changed it into UTF slug. That is why I need the redirection.

If you paste a URL with greek characters somewhere you get this link

https://fellachidis.gr/product/%CE%B6%CE%B1%CE%BC%CF%80%CE%BF%CE%BD%CE%BF%CF%84%CF%85%CF%81%CE%BF%CF%80%CE%B9%CF%84%CE%B1-%CF%83%CF%86%CE%BF%CE%BB%CE%B9%CE%B1%CF%84%CE%B1-%CE%BC%CE%B5-%CF%83%CE%B1%CE%BB%CF%84%CF%83%CE%B1/

and when I try to add it to the Redirected from column the plugin repace it with /…./ and does not work.

You can see a video with the problem here https://ecnbwt4l5m.vmaker.com/record/rlp6CzqoaAnrvYrl

Any updates on the problem?

After 2 months this still has not been fix