Sorry, I thought you were adding a custom object.
Without being able to look over your shoulder, it’s hard to know what went wrong but, yeah, if you created the project, opened the project, added the default object, cleanly compiled it, and moved/copied the package to the community folder, it should show.
After you added it to the community folder, did you restart the Sim? Sometimes things will show if you close the project and then reopen it. But a lot of times a reboot is needed to bring the package in.