【Subject】： Edit the subject of a multimedia message.
【Edit content】： Edit the content of the text of the multimedia message.
This includes the following options:
Done：Finish the message editing.
Input method：To select the input method to edit a multimedia message.
Add picture：To insert an image to the multimedia message.
Add audio：To insert an audio file to the multimedia message.
Add video：To insert a video file to the multimedia message.
Ad attachment：To insert an attachment to the multimedia message.
Add slide before：To insert a new slide ahead of the current slide.
Add slide after：To insert a new slide behind the current slide.
Preview：To preview the currently edited multimedia message.
Slide timing：To set the play time of the current multimedia message slide.
1.2.2 Inbox
You can view the received multimedia messages in the inbox and perform the following operations:
View: To view a multimedia message, and save the attachment of picture or others in the
multimedia message.
Reply: To reply a multimedia message to the sender directly.
Reply by SMS: To reply through SMS.
All: To reply all through MMS.
Forward: To forward the multimedia message to others.
Delete: To delete current multimedia message.
Delete all: To delete all multimedia messages in the inbox.
Templete：Store the current multimedia message by templete.
