There are shadows when the product is photographed, which is difficult to dig in the later stage. Is there any way to get rid of the shadow?

There are many ways to cut the picture, but in this picture, the lines are smooth, so I suggest using the pen tool, but the pen will be stiff after being buckled, so you should try to soften the edges (1, the finished picture is used to establish the selection area, 2. Select-Modify-Zoom, select 1 pixel, 3. Feather 1 pixel, 4. ! If there are still black edges (1, create selection 2, select-modify-scale 1-2 pixel 3, deselect 4, filter-other-max/min), try it, and the effect will come out!