diff --git a/editions/prerelease/tiddlers/system/SiteDomain.tid b/editions/prerelease/tiddlers/system/SiteDomain.tid
new file mode 100644
index 000000000..fee678ff7
--- /dev/null
+++ b/editions/prerelease/tiddlers/system/SiteDomain.tid
@@ -0,0 +1,3 @@
+title: $:/SiteDomain
+
+tiddlywiki.com
\ No newline at end of file
diff --git a/editions/prerelease/tiddlers/system/SitePreviewUrl.tid b/editions/prerelease/tiddlers/system/SitePreviewUrl.tid
new file mode 100644
index 000000000..e710389e7
--- /dev/null
+++ b/editions/prerelease/tiddlers/system/SitePreviewUrl.tid
@@ -0,0 +1,3 @@
+title: $:/SitePreviewUrl
+
+https://tiddlywiki.com/prerelease/images/Introduction%20Video%20Thumbnail.jpg
\ No newline at end of file
diff --git a/editions/prerelease/tiddlers/system/SiteUrl.tid b/editions/prerelease/tiddlers/system/SiteUrl.tid
new file mode 100644
index 000000000..f3473a390
--- /dev/null
+++ b/editions/prerelease/tiddlers/system/SiteUrl.tid
@@ -0,0 +1,3 @@
+title: $:/SiteUrl
+
+https://tiddlywiki.com/prerelease/
\ No newline at end of file
diff --git a/editions/tw5.com/tiddlers/images/Introduction Video Thumbnail.jpg.meta b/editions/tw5.com/tiddlers/images/Introduction Video Thumbnail.jpg.meta
index 9b2a023c4..0e826efda 100644
--- a/editions/tw5.com/tiddlers/images/Introduction Video Thumbnail.jpg.meta	
+++ b/editions/tw5.com/tiddlers/images/Introduction Video Thumbnail.jpg.meta	
@@ -1,4 +1,4 @@
 title: Introduction Video Thumbnail.jpg
 type: image/jpeg
-tags: picture
+tags: picture external-image
 alt-text: Screenshot with a headline: TiddlyWiki. Below are several tiddlers randomly stacked.
diff --git a/editions/tw5.com/tiddlers/system/SiteDomain.tid b/editions/tw5.com/tiddlers/system/SiteDomain.tid
new file mode 100644
index 000000000..fee678ff7
--- /dev/null
+++ b/editions/tw5.com/tiddlers/system/SiteDomain.tid
@@ -0,0 +1,3 @@
+title: $:/SiteDomain
+
+tiddlywiki.com
\ No newline at end of file
diff --git a/editions/tw5.com/tiddlers/system/SitePreviewUrl.tid b/editions/tw5.com/tiddlers/system/SitePreviewUrl.tid
new file mode 100644
index 000000000..1f9f66551
--- /dev/null
+++ b/editions/tw5.com/tiddlers/system/SitePreviewUrl.tid
@@ -0,0 +1,3 @@
+title: $:/SitePreviewUrl
+
+https://tiddlywiki.com/images/Introduction%20Video%20Thumbnail.jpg
\ No newline at end of file
diff --git a/editions/tw5.com/tiddlers/system/SiteUrl.tid b/editions/tw5.com/tiddlers/system/SiteUrl.tid
new file mode 100644
index 000000000..51c5be087
--- /dev/null
+++ b/editions/tw5.com/tiddlers/system/SiteUrl.tid
@@ -0,0 +1,3 @@
+title: $:/SiteUrl
+
+https://tiddlywiki.com/
\ No newline at end of file