I have to say that I have gotten kind of lost in the discussions about loading and declaring external libraries. I would like to embrace the current best practices, but don’t have a solid overview of the whole. Would anybody be willing to write up a summary?
Don't know if https://puredata.info/docs/faq/how-do-i-install-externals-and-help-files is up to date and of help for you, but you might wanna check it and get back with more specific questions and possibly a new email subject.