Configuring a Trigger to Prevent Image Assets From Being Created

Squiz Matrix Community Website
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This example will configure a Trigger to prevent users from creating Image assets under our Site asset, displaying an error message to them instead. To configure this Trigger, follow the...

This is a companion discussion topic for the original entry at https://matrix.squiz.net/a?id=5768
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Has anyone been able to get this to work in Edit plus (edit+)? It works fine in the backend preventing the file from being created but in Edit+, through the New Asset Wizard, the file gets created.