If there is a historical video in the memory card, color labels will appear on the timeline.
Drag the timeline to the marked part to watch. If you can't watch, please check as follows:
Please make sure that the memory card has no problem and can be used normally;
Please make sure that the capacity of the memory card is normal;
If it is confirmed that there is no problem above, you can try to format the memory card.
In addition to the computer format, you can also click Settings > memory card status > format memory card in the upper right corner of the camera viewing page to format the memory card.
After formatting, the video in the memory card will be deleted.