Hi @Jennelle Hanson,
Thank you for posting in this community.
First, please make sure that your original subscription allows you to add additional file storage.
If you have already bought extra file storage via the Office 365 Extra File Storage add-on, please refer this article to increase or decrease the extra storage space for your subscription.
Increase or decrease your extra file storage.
In addition, you can view the total storage in the SharePoint Admin Center.
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