There is an important issue with respect to drawing arrows from the bow in bedrock edition. In d-pad controls option the player can either split controls and use the crossbar to interact with block, items etc as well as turning of this feature as default allows the players to interact with the blocks just by touching on the screen with the hollow circle being the indication. So is in the other controls option of "JOYSTICK". Except having the split controls option which is obviously not the main issue but DRAWING THE ARROWS! i.e. A crossbar appears as soon as you hold onto the screen but here's the thing, THE ARROW DOES NOT SHOOT IN THE DIRECTION OF THE CROSSBAR THAT APPEARS BUT IN THE DIRECTION OF where we touch the screen. The video mentioned proves this. I would like to summarise that if the arrows are not being drawn in the direction of crossbar than it is pointless to depict while aiming.
This issue is being tracked at MCPE-201558.