diff --git a/src/main/frontend/fs2/path.cljs b/src/main/frontend/fs2/path.cljs
index febdb0e430..6bd62ffcbc 100644
--- a/src/main/frontend/fs2/path.cljs
+++ b/src/main/frontend/fs2/path.cljs
@@ -11,6 +11,7 @@
   (and (string? s)
        (or (string/starts-with? s "file://")
            (string/starts-with? s "content://")
+           (string/starts-with? s "logseq://") ;; reserved for future fs protocl
            (string/starts-with? s "s3://"))))
 
 
@@ -59,11 +60,12 @@
                 (re-find #"[\u0000-\u001f\u0080-\u009f]" fname)))))
 
 
-(defn path-join
+(defn- path-join-internal
   "Joins the given path segments into a single path, handling relative paths,
   '..' and '.' normalization."
   [& segments]
   (let [segments (remove nil? segments) ;; handle (path-join nil path)
+        _ (prn ::seg segments)
         segments (map #(string/replace % #"[/\\]+" "/") segments)
         ;; a fix for clojure.string/split
         split-fn (fn [s]
@@ -99,17 +101,28 @@
          (join-fn))))
 
 (defn url-join
+  "Segments are not URL-ecoded"
   [base-url & segments]
   (let [^js url (.parse Uri base-url)
         scheme (.getScheme url)
         domain (.getDomain url)
         path (.getPath url)
-        new-path (apply path-join path segments)
+        new-path (apply path-join-internal path segments)
         ;; opt_scheme, opt_userInfo, opt_domain, opt_port, opt_path, opt_query, opt_fragment, opt_ignoreCase
         new-url (.create Uri scheme nil domain nil new-path nil nil nil)]
     (.toString new-url)))
 
-(defn path-normalize
+
+(defn path-join
+  "Join path segments, or URL base and path segments"
+  [base & segments]
+  (prn base segments)
+  (if (is-file-url base)
+    (apply url-join base segments)
+    (apply path-join-internal base segments)))
+
+
+(defn- path-normalize-internal
   "Normalize path using path-join, break into segment and re-join"
   [path]
   (path-join path))
@@ -121,23 +134,50 @@
         scheme (.getScheme uri)
         domain (.getDomain uri)
         path (.getPath uri)
-        new-path (path-normalize path)
+        new-path (path-normalize-internal path)
         ;; opt_scheme, opt_userInfo, opt_domain, opt_port, opt_path, opt_query, opt_fragment, opt_ignoreCase
         new-uri (.create Uri scheme nil domain nil new-path nil nil nil)]
     (.toString new-uri)))
 
+(defn path-normalize
+  "Normalize path or URL"
+  [path]
+  (if (is-file-url path)
+    (url-normalize path)
+    (path-normalize-internal path)))
 
-(defn relative-path
-  "Get relative path from base path"
-  [base path]
+(defn trim-dir-prefix
+  "Trim dir prefix from path"
+  [base sub]
   (let [base (path-normalize base)
-        path (path-normalize path)]
+        path (path-normalize sub)]
     (if (string/starts-with? path base)
       (string/replace (subs path (count base)) #"^/+", "")
       (do
-        (js/console.error "unhandled relative path" base path)
+        (js/console.error "unhandled trim-base" base path)
         path))))
 
+
+(defn relative-path
+  "Get relative path from base path.
+   Works for both path and URL."
+  [base-path sub-path]
+  (let [base-path (path-normalize base-path)
+        is-url (is-file-url base-path)
+        sub-path (path-normalize sub-path)]
+    (if (string/starts-with? sub-path base-path)
+      (string/replace (subs sub-path (count base-path)) #"^/+", "")
+       ;; append as many .. 
+      (let [base-segs (string/split base-path #"/" -1)
+            path-segs (string/split sub-path #"/" -1)
+            common-segs (take-while #(= (first %) (second %)) (map vector base-segs path-segs))
+            base-segs (drop (count common-segs) base-segs)
+            path-segs (drop (count common-segs) path-segs)
+            base-prefix (repeat (max 0 (dec (count base-segs))) "../")]
+        #_{:clj-kondo/ignore [:path-invalid-construct/string-join]}
+        (str (concat base-prefix (string/join "/" path-segs)))))))
+
+
 (defn decoded-relative-uri
   "Get relative uri from base url, url-decoded"
   [base-url path-url]
@@ -152,5 +192,5 @@
 (defn parent
   [path]
   ;; ugly but works
-  (path-normalize (str path "/..")))
+  (path-normalize-internal (str path "/..")))