Hey @PaulBoudreau, welcome to the Nextcloud community and thanks for supporting Nextcloud snap 
Sorry to hear you are having issues with your Nextcloud snap installation. If you’ve come this far, you’re on the right track! There is a good chance someone in the community has had a similar issue and knows how to resolve it.
Below are some links to how-to’s answering frequently asked questions and may help you help yourself;
- How to install Nextcloud snap
- How to configure Nextcloud snap
- How to edit config.php for Nextcloud snap
- How to use OCC management console for Nextcloud snap
- How to revert Nextcloud snap after failed update
- How to manage failed automatic update in Nextcloud snap
- Nextcloud snap wiki and support
Have you seen How to enable-https with a tailscale cert? · Issue #2684 · nextcloud-snap/nextcloud-snap · GitHub, maybe that helps?
Here’s a guide for Nextcloud AIO, Easy setup: Container-less Tailscale as reverse proxy · nextcloud/all-in-one · Discussion #6817 · GitHub, dunno if you can make heads or tail-scales out of that 
Bar having used tailscale or similar personally, you’ll have to wait for knowledgeable folks to help sort out your issue, so please be patient…