If I understand the question, any actual attachment (such as files or images) in a message does count?towards "memory" or storage limits but messages which are only text will not. That also means message chains added to a reply will not count because they are not an actual attachment.? Moderators can edit messages and remove extraneous attachments, if necessary. Anything removed from storage is no longer counted.
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See?/helpcenter/ownersmanual/1/viewing-and-managing-your-group-s-storage?single=true?for further information.
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Jim