How to calculate the total sum size of uploaded files in use in nodebb? When using a cdn like s3 or not

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Hello, as the title says, how do I calculate the total size of files in use in nodebb?

I'm trying to use a CDN like s3, but when I searched, I found that I had to read all objects in the bucket and calculate the file size like this.
Is there no other way to find out the total size of files in use in nodebb?
https://stackoverflow.com/questions/32192391/how-do-i-find-the-total-size-of-my-aws-s3-storage-bucket-or-folder