How to use Box app for iPhone?

Excuse me, could you please elaborate on how to effectively utilize the Box app on an iPhone? I'm particularly interested in understanding the process of uploading, sharing, and managing files seamlessly through this platform. Is there a step-by-step guide you could provide, or are there any specific features that stand out as particularly user-friendly or efficient for iPhone users? Additionally, how does Box's security measures compare to other cloud storage options available for mobile devices? I'm looking to ensure that my files remain secure while leveraging the convenience of the app.