Hi, NolaMae,
I am an Independent Advisor and will assist you.
jpg format is more recognized than HEIC format. It is best to convert the HEIC format to .jpg.
Example: If you have a blog the HEIC images may not be recognized. The jpg images will be.
If you have the option to convert to .png try that since it does have a better quality than .jpg
On iPhone go to Settings > Camera
You will see two options
High Efficiency
Most Compatible
Choose Most compatible
This will save files as .jpg
This tool is recommended for HEIC files on Windows. Read details on keeping HEIC rather than .jpg
https://www.copytrans.net/copytransheic/
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.