HEIC files are a proprietary picture format owned and used on Apple products. They do not display on many computers and smart devices so if you post them here, you are limiting your audience and therefore the likelihood of getting good responses to your post.
Current versions of Windows 10 + have an add on that allows the photos to be viewed in Windows "Photo" app. However it will not let you save or convert HEIC files to your device.
You can set your device to save files in JPG for