Buy additional storage to your individual plan
The free Individual plan includes 5 GB of storage. If you need more, you can purchase additional storage as a monthly or yearly subscription.
Storage add-ons are available in 10 GB and 100 GB sizes. You can purchase multiple add-ons to match your needs - for example, 510 GB by selecting 5 units of 100 GB and 1 unit of 10 GB.
Note: The 10 GB add-on is available on yearly plans only and cannot be purchased as a monthly subscription.
To buy additional storage
Click your Profile icon.
Under My WorkDrive, select Plan Details. The plan details page will open. 
Scroll to the Storage used section and click Buy more storage add-on. You'll be redirected to the ZStore page.

Choose a billing cycle — Monthly or Yearly.
Enter the quantity for each add-on.
Once specified, click Proceed. 
Enter your billing details and complete the payment.
Once the payment is confirmed, your additional storage will be available immediately.
Limitations
When switching from an Individual account to a team account, your storage add-on subscriptions are cancelled and will not carry over to the new plan.
Upgrading to a new Team account — The unused portion of your storage subscription amount will be prorated and deducted from your Team plan payment.
Joining an existing Team — You must cancel your Individual Storage add-ons before joining. You can do this in one of two ways: