The only way at this time to save SD card video is to tap the Record button while it is playing back. This saves the recording to the Wyze album on your phone in real time. There is a #wishlist topic on this: Direct access to SD card with download ability. You can vote for it by clicking the VOTE button at the top of the topic.
There is also a #wishlist topic for 5GHz support that you can vote for: Support 5GHz wifi band for Wyze Cams.