Oppo
Add Members to a Contact Group auf Oppo
On Oppo phones running Coloros, a contact group is not fixed once it is created. You can open any existing group and add more people to it at any time, as long as they are already saved in your phone contacts.
The relevant function sits inside the Contacts app itself, not in a separate group manager. To add someone, go to Tap on Contacts ➔ Open the Menu ➔ Choose a Group ➔ Tap on Add contacts. From there, Tap and hold a Contact to select them, and repeat with If desired, select other Contacts for multiple additions. The group only updates after you finish with Tap on Save.
If you skip the save step, none of your selections are applied, and the group looks exactly like before. This is the most common reason a newly added member seems missing.
This method only works for contacts that already exist in your phone. If the person is not saved yet, add them as a regular contact first, then repeat the steps above to place them in the group.