You can send the file to the interlocutor by clicking on the paperclip icon, then choose between the sections "Gallery", where your photos and videos are available, "Transfer", where you can transfer money to the interlocutor, "Contacts", where you can share contacts in your phone, "Documents", where you can send files to the interlocutors and "Place" where you can send your location. In order to record a voice message, you need to hold the microphone icon in the dialog box, start recording and send using the paper airplane icon in the lower right corner.