I am getting a lot of message failed to send messages lately

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I am suddenly unable to delete just some texts from a thread. holding down on a particular message the usual options appear, click 'more' and proceed to check texts I want to delete but only option then is to Delete All which deletes the entire conversation.

Any ideas?

Yep this happens to me and all of my friends too, but the pictures still send (the people receive them) it's probably just a weird glitch it's annoying but (at least for me and the people who I imessage) the messages still send