He gained popularity for starring in the Netflix TV series Emily in Paris.
When Arnold was 18, he participated and was a finalist in the French TV show La France a un incroyable talent.
From 2012 to 2013, he studied acting at EICAR, The International Film & Television School Paris.
Arnold has also appeared in a National Theater Live production of Antony & Cleopatra alongside Ralph Fiennes and Sophie Okonedo, and in the Canal+ comedy series Platane.
[9][10] He was one of the voices for the French version of Pandemica, an animated content series about a world where the pandemic never ends.