There is a new message on the mobile phone. Why did it disappear as soon as I pressed it?

Hello! This happened to my previous MOTO phone, and I found it by accident. This short message may be a multimedia message that needs to be extracted, and it will generate GPRS Internet traffic statistics. I'm not sure whether it charges. You can view it in MMS, and if you don't want to extract it, you can delete it directly.