Nope, I have an Android. I use a free converter, sometimes it let's me sometimes it doesn't. And, even that just a couple at a time. I just wish I understood why it suddenly changed the format as it hasn't always been this way. Just happened one day! I need a new phone anyhow. But thanks bro!Okay, HEIC is an Apple format, so you have an iPhone.
Open up settings. Open "Camera". Open "Formats". Change to "Most Compatible".
To convert an existing photo from HEIC to JPG, email it to yourself. (I usually reduce it from "actual size" to "large". The email program (both iPhone native and my Yahoo mail app) converts it to JPEG.