🚀 go-pugleaf

Using 7.0
I created an animated gif by putting a bunch of files named so they retained that order (1-29) into a folder and then did Import Folders as Frames. I then add times in the animation window for each frame and then save it optimized. I've always done it this way because it works and is fairly simple but I can't edit the file later and that's what I need help with.

The deals is, whenever I try to add an image or move layers all the frames end up being that layer in the animation window. All I want to do is add some new images to the end or maybe somewhere else in one of the animated gifs instead of going through the steps like before.

Can someone tell me how to do it or what I am doing wrong?

Thanks in advance!