
Hi @X-Box-11-2021 ,
Yes, you can run a report in SharePoint Online that includes details about file and folder, which can help you understand the storage metrics for a site, including subfolders.
Here are steps:
- Go to the Site Settings page.
- Under Site Collection Administration, select Storage Metrics.
Reference: https://learn.microsoft.com/en-us/sharepoint/manage-site-collection-storage-limits
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