--- a/sat/core/constants.py	Tue Feb 18 18:13:19 2020 +0100
+++ b/sat/core/constants.py	Tue Feb 18 18:17:14 2020 +0100
@@ -133,6 +133,9 @@
     MESS_KEY_ENCRYPTED = "encrypted"
     MESS_KEY_TRUSTED = "trusted"
 
+    MESS_KEY_ATTACHMENTS = "attachments"
+    MESS_KEY_MEDIA_TYPE = "media_type"
+
     # File encryption algorithms
     ENC_AES_GCM = "AES-GCM"
 

--- a/sat/core/xmpp.py	Tue Feb 18 18:13:19 2020 +0100
+++ b/sat/core/xmpp.py	Tue Feb 18 18:17:14 2020 +0100
@@ -20,6 +20,7 @@
 import time
 import calendar
 import uuid
+import mimetypes
 from functools import partial
 import shortuuid
 from sat.core.i18n import _
@@ -656,6 +657,14 @@
         """A message sending can be cancelled by a plugin treatment"""
         failure.trap(exceptions.CancelError)
 
+    def isMessagePrintable(self, mess_data):
+        """Return True if a message contain payload to show in frontends"""
+        return (
+            mess_data["message"] or mess_data["subject"]
+            or mess_data["extra"].get(C.MESS_KEY_ATTACHMENTS)
+            or mess_data["type"] == C.MESS_TYPE_INFO
+        )
+
     def messageAddToHistory(self, data):
         """Store message into database (for local history)
 
@@ -665,7 +674,9 @@
         if data["type"] != C.MESS_TYPE_GROUPCHAT:
             # we don't add groupchat message to history, as we get them back
             # and they will be added then
-            if data["message"] or data["subject"]:  # we need a message to store
+
+            # we need a message to store
+            if self.isMessagePrintable(data):
                 self.host_app.memory.addToHistory(self, data)
             else:
                 log.warning(
@@ -689,8 +700,9 @@
         if data["type"] != C.MESS_TYPE_GROUPCHAT:
             # we don't send groupchat message to bridge, as we get them back
             # and they will be added the
-            if (data["message"] or data["subject"]):  # we need a message to send
-                                                        # something
+
+            # we need a message to send something
+            if self.isMessagePrintable(data):
 
                 # We send back the message, so all frontends are aware of it
                 self.host_app.bridge.messageNew(
@@ -995,7 +1007,7 @@
         self.host = host
 
     def parseMessage(self, message_elt):
-        """parse a message XML and return message_data
+        """Parse a message XML and return message_data
 
         @param message_elt(domish.Element): raw <message> xml
         @param client(SatXMPPClient, None): client to map message id to uid
@@ -1123,7 +1135,8 @@
             log.debug("history is skipped as requested")
             data["extra"]["history"] = C.HISTORY_SKIP
         else:
-            if data["message"] or data["subject"]:  # we need a message to store
+            # we need a message to store
+            if self.parent.isMessagePrintable(data):
                 return self.host.memory.addToHistory(self.parent, data)
             else:
                 log.debug("not storing empty message to history: {data}"
@@ -1138,7 +1151,7 @@
         if C.MESS_KEY_ENCRYPTION in data:
             data["extra"]["encrypted"] = C.BOOL_TRUE
         if data is not None:
-            if data["message"] or data["subject"] or data["type"] == C.MESS_TYPE_INFO:
+            if self.parent.isMessagePrintable(data):
                 self.host.bridge.messageNew(
                     data["uid"],
                     data["timestamp"],