Why the record videos cannot be viewed after inserted the SD card?

Sometimes, it needs to wait for a period of time to show the recording files at the beginning of setting record.
If the record videos still cannot be viewed, format the SD card on your computer directly.
Or you can do it as follow:
Confirm the function of the SD card if normal or not.
Confirm the memory is 4GB at least.
Confirm your phone connected to network.