Where do my imported contents go?

I just converted a scene into Unreal, so have all the files in my project.
How can I save it, that i can use it for other projects?

It seems that when I start a new project, those files are not there.

Can I only use it for the current project?

Thank you

Epic only offer the EGS Launcher atm, which isn’t that useful (no sub-folders etc).
However, the ‘Migrate’ editor option is useful for copying assets to other projects.
As is the Add-To-Project Launcher option when its actually available and offered.
Otherwise, you have to manage your own assets into Sub-Projects & Templates.

Thank you, I will put them all in a folder, and copy them whenever needed.