Reference

• https://www.youtube.com/watch?v=jLM1nGgsT-I
• Grokking
• Insider

Functional requirements

• Upload/download
• auto sync files between devices.
• Notification
• offline editing. Once online, auto sync files.
• support storing large files up to a GB
• ACID of all file operations.

Stretch goal:

• share file/folder
• file revisions. The customer can go back to any version of the file.

Clarification:

• app type: mobile or web
• file format
• encryption
• file size limit