diff --git a/scripts/langindex.json b/scripts/langindex.json
index 49cc3dddf..57ee82499 100644
--- a/scripts/langindex.json
+++ b/scripts/langindex.json
@@ -1602,6 +1602,7 @@
   "core.errorinvalidresponse": "local_moodlemobileapp",
   "core.errorloadingcontent": "local_moodlemobileapp",
   "core.errorofflinedisabled": "local_moodlemobileapp",
+  "core.erroropenfiledownloading": "local_moodlemobileapp",
   "core.erroropenfilenoapp": "local_moodlemobileapp",
   "core.erroropenfilenoextension": "local_moodlemobileapp",
   "core.erroropenpopup": "local_moodlemobileapp",
diff --git a/src/core/lang.json b/src/core/lang.json
index b4d4d57f0..05b6db48f 100644
--- a/src/core/lang.json
+++ b/src/core/lang.json
@@ -100,6 +100,7 @@
     "errorinvalidresponse": "Invalid response received. Please contact your site administrator if the error persists.",
     "errorloadingcontent": "Error loading content.",
     "errorofflinedisabled": "Offline browsing is disabled on your site. You need to be connected to the internet to use the app.",
+    "erroropenfiledownloading": "Error opening file: you need to wait for the download to complete.",
     "erroropenfilenoapp": "Error opening file: no app found to open this type of file.",
     "erroropenfilenoextension": "Error opening file: the file doesn't have an extension.",
     "erroropenpopup": "This activity is trying to open a popup. This is not supported in the app.",