I've written a trigger that can find all content related to the Tags on an opportunity.

I have related the content to the Opportunity, but it shows up in the "Content" related list and not the "Related Content" related list where there are actions to deliver content. 

I added Opportunity as a Field on the Content object to try and achieve the relationship, and I am getting results in the Content related list, but I really don't want it there, it needs to be in Related Content. 

trigger opportunityTagContent on Opportunity (before insert, before update) {

String tagN;


   for(Opportunity o: Trigger.new){
   //get all tags for this opportunity
    list<OpportunityTag> list_tags = new list<OpportunityTag>();
     for (OpportunityTag ot : [SELECT Id, Name, ItemId, Type FROM OpportunityTag WHERE ItemId = : o.Id]){
     if(ot.Type == 'Public'){
       // Create a new wrapper object
        tagN = String.valueOf(ot.Name);
        //now we should have a list of Opportunity Tags to work with
         System.debug('********** TAGN ' + tagN);
          String searchquery='FIND\'' + tagN + '\'IN ALL FIELDS RETURNING ContentVersion(Id, ContentDocumentId)'; 
          
          List<List<ContentVersion>>searchList= search.query(searchquery);
          //ContentVersion[] is a list using searchList - first returned item in the searchQuery - id
          ContentVersion[] cv = ((List<ContentVersion>)searchList[0]);
             for(ContentVersion convers : cv){
             convers.Opportunity__c = o.id;
             update convers;
             }         
          
        }
    
    }
   
  }
     
}

 Thanks,

Eva