I need help

Hello everyone, I would like to know if someone could help me please. I have an Oppo A16 phone, Android version: 12, app version: 3.74b331712, and I want to change the lock screen in Klck, but when I edit everything and give it permissions, and click the save icon, I only get an ad saying saved, and when I turn off the phone and check the lock screen, it is not there. (It is worth mentioning that in Klwp, when I change a wallpaper, it is displayed correctly on the home screen and gives me options to change it wherever I want, except that on the lock screen it does not appear as I want, only the photo is seen). Could someone help me or tell me if it is my phone that does not allow it? Please, thank you all.