Hello, 

I have a trigger afterInsert on attachment . When an attachment is created on contact , it is automatically inserted in a custom object . The id of this custom object is referenced in a custom field of the contact . The file is inserted in the custom object . but when i click on "View file " the file is not viewd .In fact the title and the number of KO is mentioned in the file but it is not seen , i dont now why . Here is the apex code : 

public with sharing class MADEL_TR005CreateAttachment 
{
	
	public static void CreerAttachmentOncontactMADEL(List<Attachment> lstattachment)
    {

		Map<Id,Id> mapgetIdcontactMadelfromContact = new Map<Id,Id>();
		Set<Id> contactIds=new Set<Id>();


		for(Attachment att:lstattachment)
		{
			contactIds.add(att.ParentId);
			
			
		}
		
		List<Contact>lstcontacts=[select Id ,idcontactMADEL__c from Contact where Id IN:contactIds ];
		
		
		for(Contact contact:lstcontacts)
		{
			mapgetIdcontactMadelfromContact.put(contact.Id,contact.idcontactMADEL__c);
		}
		List<Attachment>attachtoInsert=new List<Attachment>();
		
	 for(Attachment a:lstattachment)
		{
			Attachment attach=new Attachment(name = a.name, body = a.body, parentid = mapgetIdcontactMadelfromContact.get(a.ParentId));
			attachtoInsert.add(attach);

		}
		insert attachtoInsert;





    }

}

 I really need your Help , Thanks !