Help with removing shadows

Actually there is a quick and dirty trick that should work. Place the camera a little to the side, and get someone to hold up a piece of black cardboard beside you, big enough to cover the original as seen from the camera. You'll need to correct the perspective afterwards, but that's straightforward, much easier than removing reflections.

In any case, use your eyes. If you can see reflections, they'll be 100 times more prominent in the photo.

I didn't look at the image before JSM included it in the message. I should have, because this isn't a shadow, it's glass reflections and a bad case at that. That's even more impossible to remove afterwards, to the point where you can safely abandon the whole idea, so my point is emphasized.

This is why professional photographers like myself still have a living. It can be done, but before pressing the shutter, not afterwards. I use a pretty advanced setup with cross-polarized light for cases like this.

It might be possible using ordinary lights, but it requires tightly controlled lighting and an otherwise completely dark room. Place two lights at 45 degrees angle to the sides. Cover all shiny surfaces. Without polarizing it's impossible to eliminate reflections completely, but it might get it down to an acceptable level.

All you need to do is place two lights to the sides, so that you don't cast a shadow. Trust me, that's much faster than attempting to remove a shadow already there. If there's glass, avoiding reflections is a separate problem.

That shadow is now baked into the pixel values in the image. It's part of the image. There's no way to remove it other than by manually altering the image, painting it out. Even to an experienced user that's a lot of work.

Photoshop or not, you still need to take some basic precautions when photographing.