What should I do if I can't add pictures to Huawei's mobile phone to send text messages?

Please see if the multimedia message you sent exceeds 300KB. Please delete some contents, control the size of the multimedia message to 300KB, and then try to send it. The network status or signal is not good, please resend later.

2. Or check whether the number that sent you the text message is in the blacklist of the mobile phone housekeeper, or the format of the sending number is incorrect, which may lead to the failure of sending the information. Please enter the correct number and try again.