Update local-instance.md

Clarifying DNS-challenge description.

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@ -22,10 +22,11 @@ The normal way is the following:
**Hint:** You may have a look at [this video](https://youtu.be/zk-y2wVkY4c) for a more complete but possibly outdated example. **Hint:** You may have a look at [this video](https://youtu.be/zk-y2wVkY4c) for a more complete but possibly outdated example.
## 3. Use the ACME DNS-challenge ## 3. Use the ACME DNS-challenge
You can alternatively use the ACME DNS-challenge to get a valid certificate for Nextcloud. Here is described how to set it up: https://github.com/nextcloud/all-in-one#how-to-get-nextcloud-running-using-the-acme-dns-challenge You can alternatively use the ACME DNS-challenge to get a valid certificate for Nextcloud. Here is described how to set it up using an external caddy reverse proxy: https://github.com/nextcloud/all-in-one#how-to-get-nextcloud-running-using-the-acme-dns-challenge
## 4. Use Cloudflare ## 4. Use Cloudflare
If you do not have any control over the network, you may think about using Cloudflare Tunnel to get a valid certificate for your Nextcloud. However it will be opened to the public internet then. See https://github.com/nextcloud/all-in-one#how-to-run-nextcloud-behind-a-cloudflare-tunnel how to set this up. If you do not have any control over the network, you may think about using Cloudflare Tunnel to get a valid certificate for your Nextcloud. However it will be opened to the public internet then. See https://github.com/nextcloud/all-in-one#how-to-run-nextcloud-behind-a-cloudflare-tunnel how to set this up.
## 5. Buy a certificate and use that ## 5. Buy a certificate and use that
If none of the above ways work for you, you may simply buy a certificate from an issuer for your domain. You then download the certificate onto your server, configure AIO in [reverse proxy mode](./reverse-proxy.md) and use the certificate for your domain in your reverse proxy config. If none of the above ways work for you, you may simply buy a certificate from an issuer for your domain. You then download the certificate onto your server, configure AIO in [reverse proxy mode](./reverse-proxy.md) and use the certificate for your domain in your reverse proxy config.