Messages are generally no longer divided between SMS or MMS. If a file such as a photo/image is attached to the message, it gets automatically converted in an MMS.
Messages sent and received are organized into conversations and clearly stored on the xiaomi device. After sending a message, a so-called conversation is started and the content is stored in detail.

Android 10 (MIUI 12.0)
Step 1:  Open the  Messaging app
Step 2:  Choose a  conversation  or tap on  Add
Step 3:  Tap on  Contacts
Step 4:  Choose one or more  contacts
Step 5:  Tap on  OK
Step 6:  Type a  message
Step 7:  Tap on  Send
  1. Open the Messaging app
  2. Choose a conversation or tap on Add
  3. Tap on Contacts
  4. Choose one or more contacts
  5. Tap on OK
  6. Type a message
  7. Tap on Send

Xiaomi Instructions
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