support cancel on BT load/save
support cancel on BT load/save

seanisom/vtp,markraz/vtp,seanisom/vtp,seanisom/vtp,nakijun/vtp,nakijun/vtp,markraz/vtp,markraz/vtp,nakijun/vtp,markraz/vtp,seanisom/vtp,markraz/vtp,nakijun/vtp,seanisom/vtp,nakijun/vtp