As the Workspace Owner, Admin or Billing Moderator in your Lumin account, head over to your Workspace's Settings page.
Then, select Billing.
Click Manage on the subscription you want to upgrade. Then click Upgrade subscription.
Select the same plan your Workspace is on.
In this example, this Workspace is on an annual billing cycle of the Pro plan.
By upgrading, this Workspace will have a limit of 400 documents per month.
Finally, click Complete purchase.
How do I increase my document limit?
Each Lumin plan has a different limit on documents that your Workspace can download, share, or print.