Thank you so much for the links. I’ve already read those links and attempted the techniques therein, but unfortunately, I have failed. After activating my package and adding dependencies, I got baffling error messages when I did “using MyPackage”. I’ve reverted all of this because I needed to be able to work on my package, and it was no longer functional under this package infrastructure. Because I’ve reverted all these changes, I can’t tell you the literal error messages.
Roughly speaking, it told me that the dependencies had not been properly installed, and it suggested a Pkg command to fix it. The Pkg command it suggested did nothing.
Part of the issue may be that I found no clear explanation of “projects”. I think all the tutorials that explain how to make packages, gloss over which project should be activated at what time.