Dropbox family free
Only for macOS, iOS, iPadOS users (Apple users basically)
Once the account is made, you can use it everywhere, just need an Apple device to create the account
- Join the testflight (beta programme, through which developers can push there test builds to users who want to test the application)
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- Download the application, and enroll the beta.
- Go to select a plan, choose the family plan, with 6TB of storage
- Beta testers aren't charged for IAPs.
- Use the same account across everywhere you want, and enjoy the free 6TB of storage