Digital Time Capsule App Development

I need a cross-platform (iOS and Android) app that allows for the storage of digital content. The app will serve as a digital time capsule for my granddaughter, with reminders and prompts for content creation.

Key Features:
- A user-friendly interface where content can be categorized monthly and yearly
- Monthly push notifications with prompt questions
- Ability to store and categorize photos, texts and videos
- Monthly data montages sent to my phone
- Options for data handling: printing, thumb drive, or vault storage
- Prompts for creating future time capsules for significant life events
- An option for a trustee to manage the account in case of unforeseen circumstances

Ideal Skills:
- Experience in cross-platform app development
- Proficiency in UI/UX design
- Familiarity with implementing push notifications and data montages
- Understanding of digital content storage systems

This project requires someone with the ability to translate a complex concept into a user-friendly app. I am looking for a developer who has a keen understanding of creating engaging and functional mobile applications.