When we receive an SMS message with important details on the OnePlus smartphone, such as an address, phone number, or a one-time web page login confirmation code, we can copy and paste the entire message content to another location.

Note: To paste the content to another location, we tap and hold the appropriate text box and select the Paste button.

Android 10 | OxygenOS 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

OnePlus Instructions