Hi
Thanks for your reply, having reading the article, the following confirms something is not working correctly
"When you share HEIF or HEVC media using other methods, such as AirDrop, Messages, or email, it's shared in a more compatible format, such as JPEG or H.264."
When i share the image via the mail app, it is nopt being shared in the compatible format, it is still being attached as a HEIC file and therefore the recipient cannot view the file
Thanks
Simon