EasyImport is a simple and easy-to-use app that enables you to import photos from an SD Card to your iOS Device.
Apple iPhones can only read formatted cards such as: APFS, APFS (encrypted), macOS Extended (HFS+), exFAT (FAT64), FAT32, or FAT
You will need a Lighting (iPhone 14 or lower) or USB-C (iPhone 15 or greater) to plug in your SD Card or USB Drive. See attached Dongles recommended.
https://www.apple.com/uk/shop/product/MJYT2ZM/A/lightning-to-sd-card-camera-reader - Lighting
https://www.apple.com/uk/shop/product/MUFG2ZM/A/usb-c-to-sd-card-reader - USB C
(Note: EasyImport also allows access to import from Folders & USB Drives)