Downloading files on the iPhone used to be so awkward I never did it. Where did files disappear to? There was no Downloads folder. Now iOS 13 has changed all that and you can download files and find them afterwards. You can even access downloads made on your iPhone on an Apple Mac or Windows PC. Here's how it works https://rawinfopages.co.uk/easy-step-by-step-guide-to-safari-downloads-on-the-iphone/