I am able to recreate this issue on Wyze Android app v3.15.569.
I found a small workaround. For some reason if you have Samsung Gallery app already open then the video will not be available. However, if you force close the Gallery app and open it back and scroll then the video will show itself. Also, every time I record a clip it takes an additional screenshot in my Gallery app some reason.
Below is the list of Android app version which exhibit this issue.
v3.1.5.569 issue
v3.1.0.564 issue
v3.0.5.558 okay
v3.0.0.519 okay
v2.50.9.512 okay
Cam V3
V3 FW: 4.36.13.0416
Wyze Android app: 3.15.569
Samsung Gallery app 14.5.01.2
Samsung Galaxy S20 FE on One UI 5.1 (Android 13)