Why Sending HEIC Photos to Windows Clients Almost Always Causes Trouble

https://thedatascientist.com/heic-to-jpg-converter-best-worst-options/

Since Apple switched to HEIC in 2017, compatibility has lagged — and your clients notice The data suggests this is not an edge case. Apple introduced HEIC as the default photo format with iOS 11 in 2017 to save space and improve quality