Design a Cloud File Storage Service

Design a cloud file storage and collaboration service similar to Google Drive. The system should support: - Uploading, downloading, deleting, moving, and renaming files and folders. - A hierarchical folder structure per user or organization. - Sharing files and folders with users or groups using permissions such as owner, editor, commenter, and viewer. - Large file uploads with resumability. - File version history and restore. - Synchronization across web, desktop, and mobile clients. - Search by file name and basic metadata. - High availability, durability, and security. Assume the service has tens of millions of users, stores petabytes of data, and must handle high read and write traffic. Describe the high-level architecture, APIs, storage model, metadata model, synchronization strategy, consistency model, scaling approach, and major trade-offs.