diff --git a/web/apps/photos/src/components/Upload/Uploader.tsx b/web/apps/photos/src/components/Upload/Uploader.tsx
index 0d310d7f9..cfd674e3f 100644
--- a/web/apps/photos/src/components/Upload/Uploader.tsx
+++ b/web/apps/photos/src/components/Upload/Uploader.tsx
@@ -324,10 +324,12 @@ export default function Uploader({
     // Trigger an upload when any of the dependencies change.
     useEffect(() => {
         const allItemAndPaths = [
-            // See: [Note: webkitRelativePath]
+            // See: [Note: webkitRelativePath]. In particular, they use POSIX
+            // separators.
             webFiles.map((f) => [f, f.webkitRelativePath ?? f.name]),
             desktopFiles.map((fp) => [fp, fp.path]),
             desktopFilePaths.map((p) => [p, p]),
+            // ze[1], the entry name, uses POSIX separators.
             desktopZipItems.map((ze) => [ze, ze[1]]),
         ].flat() as [UploadItem, string][];
 
diff --git a/web/packages/next/types/ipc.ts b/web/packages/next/types/ipc.ts
index d5007ea80..c85106241 100644
--- a/web/packages/next/types/ipc.ts
+++ b/web/packages/next/types/ipc.ts
@@ -641,7 +641,7 @@ export interface FolderWatchSyncedFile {
  * >
  * >  The path stored MUST NOT contain a drive or  device letter, or a leading
  * >  slash. All slashes MUST be forward slashes '/' as opposed to  backwards
- * >  slashes '\' for compatibility with Amiga and UNIX file systems etc.  If
+ * >  slashes '\' for compatibility with Amiga and UNIX file systems etc. If
  * >  input came from standard input, there is no file name field.
  * >
  * > https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
diff --git a/web/packages/shared/hooks/useFileInput.tsx b/web/packages/shared/hooks/useFileInput.tsx
index ae1dfcab0..71f027cef 100644
--- a/web/packages/shared/hooks/useFileInput.tsx
+++ b/web/packages/shared/hooks/useFileInput.tsx
@@ -60,6 +60,10 @@ export default function useFileInput({
     // containing the relative path to the selected directory.
     //
     // https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement/webkitdirectory
+    //
+    // These paths use the POSIX path separator ("/").
+    // https://stackoverflow.com/questions/62806233/when-using-webkitrelativepath-is-the-path-separator-operating-system-specific
+    //
     const directoryOpts = directory
         ? { directory: "", webkitdirectory: "" }
         : {};