diff --git a/src/web.lisp b/src/web.lisp
index 64781d1..9fe8f62 100644
--- a/src/web.lisp
+++ b/src/web.lisp
@@ -1030,25 +1030,64 @@
 (defroute ("/edit/archive/:slug" :method :GET) (&key slug)
   (if (nera:get-archive-entry :slug slug)
       (progn
-	(hermetic:auth (:logged-in)
-		       ;; Authorised
-		       (let ((alert (utils:get-and-reset-alert)))
-			 (render "/user/edit-archive.html"
-				 (append (auth:auth-user-data)
-					 `(:alert ,alert
-					   :system-data ,(nera:system-data)
-					   :db-data ,(nera:get-archive-entry :slug slug)
-					   :data ,(storage:open-text-file
-						   "" "archive" slug)))))
-		       ;; Not Authorised
-		       (progn
-			 (utils:set-alert "You are not logged in.")
-			 (redirect "/login"))))
+	(hermetic:auth
+	 (:logged-in)
+	 ;; Authorised
+	 (let ((alert (utils:get-and-reset-alert)))
+	   (render "/user/edit-archive.html"
+		   (append (auth:auth-user-data)
+			   `(:alert ,alert
+			     :system-data ,(nera:system-data)
+			     :db-data ,(nera:get-archive-entry :slug slug)
+			     :data ,(storage:open-text-file "" "archive" slug)))))
+	 ;; Not Authorised
+	 (progn
+	   (utils:set-alert "You are not logged in.")
+	   (redirect "/login"))))
       (on-exception *web* 404)))
 
 (defroute ("/edit/archive-thumbnail" :method :POST) ()
-  (utils:set-alert "ROUTE NOT IMPLEMENTED")
-  (redirect "/user/archive"))
+  (destructuring-bind
+      (&key archive-slug thumbnail-file authenticity-token &allow-other-keys)
+      (utils:request-params (lack.request:request-body-parameters ningle:*request*))
+    (cond ((not (string= authenticity-token (auth:csrf-token)))
+	   `(,+forbidden+ (:content-type "text/plain") ("Denied")))
+	  (t (hermetic:auth
+	      (:administrator)
+	      ;; Authorised
+	      (cond ((utils:string-is-nil-or-empty? archive-slug)
+		     (utils:set-alert "No archive slug provided. Thumbnail not updated.")
+		     (redirect "/user/archive"))
+
+		    ((null (nera:get-archive-entry :slug archive-slug))
+		     (utils:set-alert "Cannot file thumbnail's archive entry. Nothing updated.")
+		     (redirect "/user/archive"))
+
+		    ((not (str:contains? "image" (caddr thumbnail-file) :ignore-case t))
+		     (utils:set-alert "File uploaded is not an image. Thumbnail not updated.")
+		     (redirect (format nil "/edit/archive/~a" archive-slug)))
+
+		    (t (utils:set-alert "Thumbnail updated.")
+		       (storage:store-file
+			""
+			"archive"
+			(archive::thumbnail-slug-of
+			 (nera:get-archive-entry :slug archive-slug))
+			thumbnail-file)
+		       (nera:update-archive-entry-property
+			:slug archive-slug
+			:property 'archive::thumbnail-file-type-of
+			:value (caddr thumbnail-file))
+		       (utils:create-thumbnail
+			"archive"
+			(archive::thumbnail-slug-of
+			 (nera:get-archive-entry :slug archive-slug))
+			t)
+		       ;; Integrate updating Meilisearch here.
+		       (redirect (format nil "/edit/archive/~a" archive-slug))))
+	      ;; Not Authorised
+	      (progn (utils:set-alert "You are not authorised to delete this archive entry.")
+		     (redirect "/login")))))))
 
 (defroute ("/rename/archive-entry" :method :POST) ()
   (utils:set-alert "ROUTE NOT IMPLEMENTED")
@@ -1058,11 +1097,6 @@
   (utils:set-alert "ROUTE NOT IMPLEMENTED")
   (redirect "/user/archive"))
 
-
-(defroute ("/edit/archive-thumbnail" :method :POST) ()
-  (utils:set-alert "ROUTE NOT IMPLEMENTED")
-  (redirect "/user/archive"))
-
 (defroute ("/archive/delete/entry" :method :POST) ()
   (destructuring-bind
       (&key slug authenticity-token &allow-other-keys)