before, I am able to move my photos from my pc to SD card. But now it won't allowed to do that. Also my picture gallery crush often latterly. Please help
Welcome to Android Central! Which phone? Are you saying that when you connect the phone to your computer via USB and make sure the USB connection protocol is set to MTP, the file explorer on the computer can't see the SD card in the phone?
What do you mean that your picture gallery "crush often latterly"? Do you mean its crashing lately?