We can decide whether undelivered messages should be automatically resent by the Messages app, or whether we want to be asked for each MAl, for example.

We have the following options to control the sending of messages on the OnePlus smartphone:

Android 10 | OxygenOS 10.0
Step 1:  Open the  Messages app
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  Chat features
Step 5:  Tap on  Resend messages if undelivered
Step 6:  Choose an  option
  1. Open the Messages app
  2. Open the menu
  3. Open the Settings
  4. Tap on Chat features
  5. Tap on Resend messages if undelivered
  6. Choose an option

OnePlus Instructions