Feedback on the new Adobe background remove/paint new one

I will come directly to my points: 

1. I had a bug where I could not 'insert' new objects in my images
2. Background removal is amazing. however, i would suggest giving the user the choice to choose which image to keep. If there are three person standing on the road, the user can choose only two person standing or the user can choose that only one person and the road stays and the rest disappears
3. When I first uploaded my image, it was small. I had to zoom in using my touchpad. Make it easy by adding the sliding bar 
4. Add a UI to undo and redo