One of the apps that have improved usability on iOS 13 is “File”. The range of documents that can be handled completely without using a PC has been greatly expanded, including support for new downloads, e-mail attachments, and external drive reading and writing.
Supports local storage / external storage
The “File” app was born as an app that connects to iCloud drives and other cloud storages to manage and view documents. iOS 13 includes a number of improvements that make external interaction more flexible. One of them is that you can now access your iPhone's local storage and external storage.
Save "Download" from Safari, ZIP is OK
The file download operation from Safari, which was difficult to handle on iPhone so far, has been greatly improved. Safari now has a "Download Manager" function that can be saved directly in "Files". Downloading from file transfer services and obtaining handouts and materials can be handled with just the iPhone.
Attach files to emails and save received files
E-mail attachments are now easier to handle. When attaching, open the "File" application from the mail creation screen, you can select a document.
Attached files of received emails can also be saved in "File".