docs: Add documentation for file download from workspaces

docs/user/docs/sessions/files/files.md

@@ -10,11 +10,11 @@
 1. Navigate to the `Session` tab.
 1. On the right side, select the corresponding session. Select the persistent
    session to upload files into your persistent workspace. Click the
-   `File Browser`:
+   `File Browser` button:
 
     ![File Browser button](file-browser-button.png)
 
-    ![Expand directory in file browser](expand-directory.png){:style="width:300px"}
+1. Wait until the list of files has loaded.
 
    ![Upload button](upload-button.png)
 
@@ -25,7 +25,7 @@
 1. Expand the directories by clicking on the directory icon (1) until you find the directories where you want to
 upload your file to. Click the upload button (2) next to the directory name.
 
-          ![Upload files button](upload-files-button.png){:style="width:300px"}
+   ![Upload files button](upload-file-button.png){:style="width:300px"}
 
       1. Now, select the file(s) to upload and confirm. The files to be uploaded are marked in green.
 
@@ -36,8 +36,33 @@ upload your file to. Click the upload button (2) next to the directory name.
       1. The upload can take a few seconds/minutes, depending on the file size.
       1. When the upload was successful, the dialog closes without error message.
 
-=== "Download files"
+<!-- prettier-ignore-end -->
+
+# Download
+
+<!-- prettier-ignore-start -->
+
+1. Navigate to the `Session` tab.
+1. On the right side, select the corresponding session. Select the persistent
+   session to download files into your persistent workspace. Click the
+   `File Browser` button:
+
+    ![File Browser button](file-browser-button.png)
+
+1. Wait until the list of files has loaded.
+
+   ![Download button](download-button.png)
+
+!!! info
+    To download files from hidden directories, e.g., the workspace
+    metadata, one has to expand these directories by clicking
+    `Show hidden files`
+
+1. Expand the directories by clicking on the directory icon (1) until you find the directories where you want to
+download your file from. Click the download button (2) next to the directory name and your browser will start the download.
+
+   ![Download files button](download-file-button.png)
 
-   Documentation for "Download files" will follow soon.
+1. You can see in your browser whether your download was successful.
 
 <!-- prettier-ignore-end -->

docs/user/docs/sessions/files/upload-button.png.license

@@ -0,0 +1,2 @@
+SPDX-FileCopyrightText: Copyright DB Netz AG and the capella-collab-manager contributors
+SPDX-License-Identifier: Apache-2.0

docs/user/docs/sessions/files/upload-file-button.png.license

@@ -0,0 +1,2 @@
+SPDX-FileCopyrightText: Copyright DB Netz AG and the capella-collab-manager contributors
+SPDX-License-Identifier: Apache-2.0