diff --git a/core/src/main/java/org/kiwix/kiwixmobile/core/main/AddNoteDialog.kt b/core/src/main/java/org/kiwix/kiwixmobile/core/main/AddNoteDialog.kt
index e280061a1..dc52f0ff4 100644
--- a/core/src/main/java/org/kiwix/kiwixmobile/core/main/AddNoteDialog.kt
+++ b/core/src/main/java/org/kiwix/kiwixmobile/core/main/AddNoteDialog.kt
@@ -117,7 +117,7 @@ class AddNoteDialog : DialogFragment() {
       .inject(this)
 
     // Returns name of the form ".../Kiwix/granbluefantasy_en_all_all_nopic_2018-10.zim"
-    zimFileName = zimReaderContainer.zimCanonicalPath
+    zimFileName = zimReaderContainer.zimCanonicalPath ?: zimReaderContainer.name
     if (zimFileName != null) { // No zim file currently opened
       zimFileTitle = zimReaderContainer.zimFileTitle
       zimId = zimReaderContainer.id.orEmpty()
diff --git a/core/src/main/java/org/kiwix/kiwixmobile/core/page/notes/viewmodel/effects/ShowOpenNoteDialog.kt b/core/src/main/java/org/kiwix/kiwixmobile/core/page/notes/viewmodel/effects/ShowOpenNoteDialog.kt
index 77873906d..8adaa9b4a 100644
--- a/core/src/main/java/org/kiwix/kiwixmobile/core/page/notes/viewmodel/effects/ShowOpenNoteDialog.kt
+++ b/core/src/main/java/org/kiwix/kiwixmobile/core/page/notes/viewmodel/effects/ShowOpenNoteDialog.kt
@@ -45,8 +45,13 @@ data class ShowOpenNoteDialog(
       { effects.offer(OpenPage(page, zimReaderContainer)) },
       {
         val item = page as NoteListItem
-        val file = File(item.zimFilePath.orEmpty())
-        zimReaderContainer.setZimFile(file)
+        // Check if zimFilePath is not null, and then set it in zimReaderContainer.
+        // For custom apps, we are currently using fileDescriptor, and they only have a single file in them,
+        // which is already set in zimReaderContainer, so there's no need to set it again.
+        item.zimFilePath?.let {
+          val file = File(it)
+          zimReaderContainer.setZimFile(file)
+        }
         effects.offer(OpenNote(item.noteFilePath, item.zimUrl, item.title))
       }
     )