fix voice messages for iOS

// FREEBIE

src/Messages/Attachments/OWSAttachmentsProcessor.m

@@ -61,6 +61,7 @@ NS_ASSUME_NONNULL_BEGIN
             [supportedAttachmentPointers addObject:pointer];
             [supportedAttachmentIds addObject:pointer.uniqueId];
         } else {
+            DDLogError(@"%@ Received unsupported attachment of type: %@", self.tag, pointer.contentType);
             TSInfoMessage *infoMessage = [[TSInfoMessage alloc] initWithTimestamp:timestamp
                                                                          inThread:thread
                                                                       messageType:TSInfoMessageTypeUnsupportedMessage];
@@ -87,6 +88,16 @@ NS_ASSUME_NONNULL_BEGIN
     return self.supportedAttachmentPointers.count > 0;
 }
 
++ (NSString *)tag
+{
+    return [NSString stringWithFormat:@"[%@]", self.class];
+}
+
+- (NSString *)tag
+{
+    return self.class.tag;
+}
+
 @end
 
 NS_ASSUME_NONNULL_END

src/Util/MIMETypeUtil.m

@@ -20,6 +20,7 @@ NSString *const OWSMimeTypeImagePng = @"image/png";
 
 + (NSDictionary *)supportedAudioMIMETypesToExtensionTypes {
     return @{
+        @"audio/aac" : @"m4a",
         @"audio/x-m4p" : @"m4p",
         @"audio/x-m4b" : @"m4b",
         @"audio/x-m4a" : @"m4a",