I know it can be done because I've downloaded pool complexes with slides saved to them. And I'm trying to build the pool and then add it to my park. Or use a pre-downloaded pool and just delete slides I don't use.

Unfortunately, either situation I can't get slides to save at all. I would really appreciate knowing how though.

And I apologize for the curtness, I'm going through a rough patch right now and don't mean to come off so rough.

You save the pool complex and then load it under building a pool. Not in the slide type.

Well I was doing that but the slides attached seem to disappear anyway...even if I save with a slide attached. I could also try toying around with the editor to see what happens.

Is the the slide connected to the pool with a path?

No. I guess that's what happened. In my rush to save outside of the scenario so I could drag and drop in the park, I must've figured connecting paths wouldn't matter. Thanks. (I might restart the park with a smaller entrance gate though)