Hello, I build a trigger that blocks file types that are in my custom metadata (DataBlock). Now I would like to change the trigger so every type except the ones in my metadata are blocked. Could you tell me by my code sample how to change the apex trigger so it does not block these file types but allows them and blocks every else?

Greetings
Jonathan

trigger DataBlockContentVersion on ContentVersion(before insert) {
    try {   
        Set<String> blockedTypes = new Set<String>();
        for (DataBlock__mdt  blockedType : [SELECT FileExtension__c FROM DataBlock__mdt WHERE FileExtension__c != null]) {
            blockedTypes.add(blockedType?.FileExtension__c?.toUpperCase());
        }
        for (ContentVersion myDocument : Trigger.new) {
            system.debug('PathOnClient '+myDocument.PathOnClient);
                
            if (myDocument.PathOnClient != null) {
                String[] parts = myDocument.PathOnClient.split('\\.'); /*Payal: Updated regex for splitting extension*/
                system.debug('part '+parts);
                if (parts.size() > 0) {
                    String ext = parts[parts.size() - 1];
                    if (blockedTypes.contains(ext.toUpperCase())) {
                       myDocument.addError('The datatype ' + ext + ' is not allowed'); 
                    }
                }
            }
        }
    } catch (Exception e) {
        throw new StringException(e.getMessage() + ' - ' + e.getLineNumber() + '\r\n' + e.getStackTraceString());
    }
}