For any wired camera, you tap View Playback in the app. While the SD card recording is playing back, you tap the Record button on that screen. When done, you tap the Stop button. The video segment that you just recorded is saved to your phone’s camera roll (Wyze album).
The downside is that you have to wait for the recording in real time. There is a top-10 Wishlist item regarding direct download of SD card clips. Please hop over and vote for and comment on it here: