You can provide more granular control by setting up the "Upload" event at the user or group levels. For example, use separate Serv-U users to categorize your districts and then add an event to each one that fires an email to the district it represents.
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Setup multiple events that act on the "Upload Complete" trigger and configure each one to only fire based on a unique "Event Filter". I'm not sure if this would work in your case, but it may be useful if you can't use multiple user accounts.
