insert file;
                    ContentVersion cv = [SELECT id, ContentDocumentId FROM ContentVersion where Id = :file.Id];
                    ContentDocumentLink link = new ContentDocumentLink();
                    link.LinkedEntityId = sr.id; // this is record i want the file to be related to
                    link.ContentDocumentId = cv.contentdocumentid;
                    link.ShareType = 'V';
                    link.Visibility = 'AllUsers';
                    insert link;