here:
administrator -> Usergroups - > select & edit the usergroup - > scroll down to "Attachment Permissions" - > Can Upload Attachments = Yes -> Space (in bytes) that a user's total attachment usage may consume (Set to 0 to not have a limit)
Change this to the limit in bytes that you want each user in that group to have.
Hope it helps.
here some limits
Quote:
350mb = 367001600
300mb = 314572800
250mb = 262144000
200mb = 209715200
100mb = 104857600
75mb = 78643200
50mb = 52428800
25mb = 26214400
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