An easy way to do this if you're using a button object is to make a new keyframe in the over state with the image you want it changed to.
I have used insert key frame which pastes the same pic which is on key frame one. How can I insert the new picture in that key frame?
either right click the keyframe and go to convert to blank keyframe, or
delete the keyframe and add a blank keyframe instead, or just erase
everything in the keyframe. Whenever you make a new keyframe, it will bring
over whatever is present in the previous keyframe unless you have flash
create a blank keyframe.
right click the keyframe and go to convert to blank keyframe. when making a new keyframe, flash will always put in what was in the previous one unless you select insert blank keyframe from the menu instead of insert keyframe.
I have done the same. But I won't see any option which will ask to insert a picture.
Further help, please. (Actually I would like to add an image from the Library).
once you have the keyframe just drag the picture from your library onto the stage. Use onion skins if you need to align it with
the previous image. If you have to import the image still, just go to file, import to library.