Mass copying and pasting of frames

Ok, so we’re using iStopMotion to shoot at 12 fps, figuring we’d duplicate each frame to gain the 24fps aka “shooting on twos.” However, this doesn’t seem doable in iSM. When I copy all the frames in a movie and past them, they’re automatically pasted at the end of the project. Is there anyway to past the frames so that automatically appear after their original?

Why do you want to duplicate each frame? If you are playing back a 24fps movie, with “on twos” you are effectively only playing back at 12fps. If you import a 12 fps movie into another 3rd party app usually the fps will be converted automatically for you to fit the destination fps of this project.