also
How to Convert HEIC to JPG on Android
On your Android phone, tap the Google Play store and install the Luma App.
Next, open the Luma app on your phone and choose the HEIC to JPG conversion option.
From there, click on the "+" button to be able to select the HEIC files on your Android that you want to convert.
or
How do I change my phone from HEIC to JPG?
How to convert HEIC to JPG on iPhone
Start the Settings app.
Tap Camera.
On the Camera settings page, tap Formats.
Tap Most Compatible.
Start the Settings app.
Tap Photos.
In the Transfer to Mac Or PC section, tap Automatic.
Open the HEIC photo you want to convert in Preview.
or go to -
How to disable HEIC Image format?
that may help you better?.