Hi @iman76845
It may be that there's not enough storage capacity available in the phone to store more than 3 seconds worth of video.
How much storage capacity is available in the phone, both internal and SD card storage?
The phone supports a micro SD card up to a maximum capacity of 512GB.
Here's how to [https://www.youtube.com/watch?v=-QC2ogU_c_E|save videos to an SD card] in the phone that may help.