LG U8210 User Manual page 75

Messaging
11. You can attach a file by moving the cursor to the Attach field.
Press the Attach key or select Attach from the Option menu. In
the Attach menu, move the cursor to the Video, Audio or Image
item, and press the OK key to attach a file. You can attach up to
2 files, and the size of attached files should be 1MB or less. You
can change the attached file for another by selecting the
attached file name. You can cancel the attached file by using the
[Option] key.
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U8210 User Guide