Most web browsers do not play .amr natively. The recipient may need to download the file and use VLC Media Player or an AMR player app.
It's unclear whether you need a (e.g., how to upload a file named s01e06.amr ) or a plot summary/episode recap (for a TV show's Season 1 Episode 6, with "AMR" as a title/acronym). upload s01e06 amr