Hello Mike Welch4.
Welcome to Microsoft Community.
I understand your need to share Loop documents outside of your organization.
Since Microsoft Loop is still in public preview, there are some features waiting to be added, and sharing to outsiders is one of them - please be patient as this feature is expected to be available this year.
In the meantime, you can send feedback to the Microsoft development team. More people wanting this feature will bring it to the attention of the development team and help speed up the development process.
Please share the feedback link here after submitting as it will allow others on the forum to vote for your submission, including me. More votes will lead to more visibility and higher priority to the development team.
You can also send feedback in the following ways. This will directly let the Loop development team know what you think.
In the bottom right corner of the Loop app, select Help> Give feedback.
For more information about Microsoft Loop, you can refer to this article: Microsoft Loop: built for the new way of work, generally available to Microsoft 365 work accounts - Microsoft Community Hub
And for your questions, please refer to the Share the right info with the right people section of that article.
Thank you for your support in improving the Microsoft product experience.
Best Regards
Eliac | Microsoft Community Support Specialist