Update source_installation.rst

add: encryption
add: configuration
add: external media

Signed-off-by: scubamuc <54933878+scubamuc@users.noreply.github.com>

admin_manual/installation/source_installation.rst

@@ -407,6 +407,12 @@ and robust technology which the Nextcloud snap team has embraced.
 Most importantly snaps are designed to be secure, sandboxed, containerized 
 applications isolated from the underlying system and from other applications.
 
+However, the snap is opinionated. 
+
+- Nextcloud snap uses recommended Apache.
+- Nextcloud snap uses recommended MySQL.
+- Nextcloud snap uses recommended PHP.
+
 Installation
 ------------
 
@@ -435,6 +441,35 @@ Upon visiting the Nextcloud installation for the first time, you will be prompte
 and password before Nextcloud is initialised. This may take a while depending on resources and the device.
 After you provide that information you will be logged in and able to install apps, create users, and upload files.
 
+HTTPS encryption
+----------------
+
+Nextcloud snap includes a service for automated HTTPS encryption and automated renewal using Lets Encrypt, 
+or self-signed certificates. Run ``nextcloud.enable-https -h`` for more information. `Managing encryption <https://github.com/nextcloud-snap/nextcloud-snap/wiki/Managing-HTTP-encryption-(HTTPS)>`_.
+
+Configuration
+-------------
+
+While the default Nextcloud configurations are mostly fine, it may be necessary to fine tune Nextcloud snap by
+editing configuration files manually or using the management console. `Configuring Nextcloud snap <https://github.com/nextcloud-snap/nextcloud-snap/wiki/Configure-Nextcloud-snap>`_.
+
+External media
+--------------
+
+Snap confinement is a security feature and determines the amount of access an application has to system resources, 
+such as files, the network, peripherals and services. Thus your Nextcloud snap is securely confined from the host 
+system. Unless you specifically allow the Nextcloud snap to access the ``/media`` or ``/mnt`` directories on the 
+host system, you will not be able to access any other directory outside of the confinement.
+
+Removable media or external storage must be mounted to either ``/media`` or ``/mnt`` as root with root permissions 
+and connected to Snap!
+
+The interface providing the ability to access removable media is not automatically connected upon install, to use 
+external storage (or otherwise use a device in ``/media`` or ``/mnt`` for data), you need to give the snap permission 
+to access removable media by connecting that interface:
+
+``sudo snap connect nextcloud:removable-media`` 
+
 Further documentation, an `extensive Wiki <https://github.com/nextcloud-snap/nextcloud-snap/wiki>`_ and `FAQ's <https://github.com/nextcloud-snap/nextcloud-snap/wiki/FAQ's>`_  can be found on the `developers GitHub <https://github.com/nextcloud-snap/nextcloud-snap>`_.
 
 .. note:: The `snapd technology <http://snapcraft.io/docs/core/>`_ is the core