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I can't send a screen shot on my MacBook Air in...

It worked before but somehow it couldn't send screen shot's anymore today. Can someone pls help. It's just like this

Welcome to the Apple Support Communities!

I understand you have added screen shots in the Messages application on your MacBook Air in the past, but you are now unable to do so.
It looks like you've tried to send one single image multiple times, so there may be an issue with this one image?  The first thing I would suggest is to quit Messages and shut down your MacBook Air.  Then, unplug the power to your modem/router, wait a minute or two, and plug the power back in.  Then start your computer and try again.  This is called "recycling the power" and basically creates a new fresh connection to the internet for you.

I'll include the resource for adding images to a Message for you below, just to confirm how you are doing this.  Try with a different screen shot, and with a photo that is not a screen shot, and let us know if the issue persists.

macOS High Sierra User Guide - Messages - Send Text Messages
 

Send text messages

You can send messages with text, photos, and other files.

Note: Before you can send messages, you need to Set up to send text messages.

 

1. In the Messages window, click the Compose button  to start a new message (or use the Touch Bar).

2. Type a name, an email address, or a phone number in the To field. As you type, Messages suggests matching addresses from your Contacts app or from people you’ve previously sent messages to.

    

   You can also click the Add button  to the right of the To field. Click a contact in the list, then click the email address or phone number.

3. Enter your message in the field at the bottom of the window. You can include any of the following:

    
    
   •  

     Text: Type text in the message field. You can use typing suggestions, if available.

      
    
   •  

     Photos or videos: Drag photos (including Live Photos) or videos to the message field, or copy and paste them.

       

     Note: If you drag a Live Photo to your message, friends see only a still photo. If you want friends to be able to see the Live Photo play, share it from the Photos app. For more information, see Use Messages to share photos.

      
    
   •  

     Files or web links: Drag or copy and paste files or web links.

      
    
   •  

     Audio clips: If you want to record an audio clip in your message, see Send audio clips.

      
    
   •  

     Emoji: Click the Emoji button  to add emoji to your message. If you add three or fewer emoji, they appear as large emoji.

      

4. Press Return on your keyboard to send the message.

Ask Siri. Say something like: “Message Mom that I’ll be late.” Learn more about Siri.

Your Mac can receive and send SMS and MMS text messages through your iPhone when you set up text message forwarding. For example, if a friend sends you a text message from a phone other than iPhone, the message appears on your Mac and iPhone in Messages.

iMessage bubbles are blue. All other message bubbles are green.

Note: To receive and send SMS and MMS messages on your Mac, your iPhone must have iOS 8.1 or later, and your iPhone and Mac must be signed into iMessage using the same Apple ID. Additionally, you must set up your iPhone.

macOS High Sierra User Guide - Photos - Use Messages and Mail to share photos

Share photos using Messages

1. In Photos, select up to 10 photos to share.

    

   Your recipients can play the video in Live Photos that you send using Messages.

2. Click the Share button  in the toolbar and choose Messages.

3. Type one or more email addresses or phone numbers, or click the Add button  and select people from Contacts.

   

   If you want, you can type a text message to include with your photos.

4. Click Send.

Take care.

最后更新：2017-10-16 04:20:45

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