Yes, files can be stored on the iPhone similar to an external USB drive. The only catch is that files must be synced using the Finder (Mac) or with iTunes or Apple Devices (Windows). Files can most easily be stored inside an iOS app folder.
Apple has launched Universal Control with macOS Monterey 12.3 and iPadOS 15.4. The much anticipated feature was first announced in 2021. Universal Control only works if each device is updated to the software version which supports the feature.
The 2022 iPhone SE (3rd generation) has the largest battery of any iPhone to date. The iPhone SE battery capacity is 2,018 mAh, giving this device the longest battery life of any iPhone.