In my app , I want to restrict the attachment of types (.txt,.msg,.rtf). The users are allowed to add 6 attachments. Among these 6 attachments in that attachment data card how to identify the presence of restricted attachment. I saw below code while searching Last(!Split(Last(data card.attachments).Name,".")).Result in ("txt") But this on will validate only the last file among the 6 attachments in the data card. Kindly help me to solve this issue.