Importing Slides in Storyline 360

Thanks for getting back to me. I found a workaround, but here's the strange part. I was working on a course that has eight modules, and I built out one module as a prototype to get feedback on before building out the whole thing. So I had the main file with about 40 slides as a skeleton, plus a second file with about five slides for the prototype. I tinkered with the prototype file after getting feedback and then wanted to import it back into the main file - but it would not let me do it. It would, however, let me import the larger file into the smaller one. That was a bit more work - more things to move around, adjust, delete, rename, etc. - but it got the job done, after some annoyance and frustration.