HTC One M8 User Manual page 179

Group
MMS
5. Tap the box that says Add text, then enter your message.
6. Tap .
Resuming a draft message
If you switch to another app or if you receive an incoming call while
composing a text message, the message is automatically saved as a draft.
1. Open the Messages app.
2. Tap a draft message, and then edit the message.
To see all draft messages in one place, tap , and then tap Drafts.
3. Tap .
Replying to a message
1. Open the Messages app.
2. Tap a contact (or phone number) to display the exchange of
messages with that contact.
Similar to a group chat, sending a group MMS lets your
recipients join the conversation you've started.
HTC One also organizes message replies in a single
conversation thread. If this is your first time to send a
group MMS, you may need to enter your mobile phone
number.
Messages 179