We can copy received or sent SMS messages from a conversation and paste them back to another field, storing the message or content in the Huawei smartphone's cache for retrieval at any time.

Android 10 | EMUI 10.0
Step 1:  Open the  Messages app
Step 2:  Choose a  conversation
Step 3:  Tap and hold a  message
Step 4:  Tap on  Copy
  1. Open the Messages app
  2. Choose a conversation
  3. Tap and hold a message
  4. Tap on Copy

Huawei Instructions