by Corey Salzano on WordPress.org
Allows .heic uploads to the Media Library. Creates .webp or .jpg copies of .heic images when they are uploaded.

The settings are located at Settings → Media → HEIC Support in the dashboard.
Allows .heic uploads to the Media Library. Creates .webp or .jpg copies of .heic images when they are uploaded. An optional feature replaces the original upload instead of creating a copy.
Creation of .webp or .jpg copies usually works on servers running ImageMagick 7 or above. Check Settings → Media → HEIC Support after activating to see if your server provides ImageMagick.