Charley R. answered 08/19/19
Edit your film, tv show, video or short like a pro with a pro!
It sounds like you have a workflow issue and for some reason the computer believes this to be the same piece of media already.
Easy fix.
Mark in and out on your first clip, export it naming it clip 1. Then import that clip. Things should no longer be considered the same and you can put that before you're clip on the timeline.
If this does not fix it I think you need a tutor or to rewatch a tutorial on importing and editing media. Please contact me if you'd like assistance. This is basic editing and why Google isn't able to answer id because you're asking how to edit with an edit program