How do I set the maximum upload for each permission?

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ClydeDev2 can you give more details?`I don't understand what you mean.

You mean setting a max file size depending on the user group, or a max number of files per group?

Are you referring to the FoF Upload extension or a different extension or Flarum feature? Please describe your use case.

I'm using fof upload.
i want to setting a max file size depending on the user group

ClydeDev2 this will require writing a custom extension. I'm not aware of anyone who implemented this yet.