When you copy files via USB, your phone will convert HEIC files to JPG on the fly. 3. Change Future Photo Formats To stop your phone from saving images as HEIC altogether: Download iCloud photos and videos - Apple Support

The "Download Apple jpg" request typically refers to two distinct needs: downloading your personal photos from iCloud in a universal format (JPG) instead of Apple’s default HEIC, or finding official Apple-related imagery like logos for creative projects. Downloading Your Personal Photos as JPG

By default, modern iPhones capture photos in High Efficiency (HEIC) format to save space. To download them as standard JPGs, use these methods: 1. Via iCloud.com (Web Browser)