If you want to save the sd card storage, First of all, please click on playback to enter the playback page and then check if there is a download button to download the video for saving. Some cameras playback with download video function.
Or please operate as below step:
1. Open the app and click the entering the device
2. Click "feature" in the lower right corner
3. Click "playback"
4. Select the date and time to be recorded
5. Click the "Record" icon in the lower right corner
6. Return to the real-time video interface
7. Click "gallery"
8. Open the video that needs to be saved
9. Click the "Share" icon in the lower left corner
10. Click "save video"
If you still have questions, please contact customer support for further assistance.