Hello. I’ve been using Comfax by Municorn for a long time and it's great for this. It turns your iPhone camera into an HD scanner with built-in OCR and auto edge-correction. Plus, it gives you a dedicated number, 256-bit encryption, and real-time delivery status. For more options, check out https://how-to-fax-from-iphone.com/ where they compare the top apps so you can pick the best fit.