Current Limitation:
- Existing shared link and external collaborator settings apply a uniform 30-day restriction across all external users
- No ability to create differentiated access rules for trusted partners or affiliated organizations

Proposed Feature:
Implement a multi-tier external collaboration access control system that allows:
1. Configurable access duration and permissions based on organizational relationship
2. Ability to create exception groups with extended or permanent access
3. Granular control to distinguish between:
- Completely external users (standard 30-day restriction)
- Trusted partners/affiliated organizations (customizable access duration)
- Specific trusted domains with distinct access rules

Use Case Example:
An organization wants to:
- Maintain strict 30-day access for unknown external collaborators
- Provide longer/permanent access for trusted partners like subsidiary companies or closely affiliated academic/research institutions

Business Value:
- Increases flexibility in collaboration management
- Reduces administrative overhead of manually managing access
- Provides more nuanced security controls