diff --git a/web/app/assets/javascripts/accounts_session_properties.js b/web/app/assets/javascripts/accounts_session_properties.js
index d0e0df211..c9551a0cf 100644
--- a/web/app/assets/javascripts/accounts_session_properties.js
+++ b/web/app/assets/javascripts/accounts_session_properties.js
@@ -279,7 +279,7 @@
       var error = false;
       for (var i = 0; i < files.length; ++i) {
         var name = files.item(i).name;
-        var ext = name.split('.').pop();
+        var ext = name.split('.').pop().toLowerCase();
         if ($.inArray(ext, ["pdf", "png", "jpg", "jpeg", "gif", "xml", "mxl", "txt"]) == -1) {
           error = true;
           break;
@@ -288,7 +288,7 @@
       }
 
       if (error) {
-        app.notifyAlert("Error", "We're sorry, but we do not allow upload of that file type. Please upload only the file types listed in the Upload dialog box.");
+        app.notifyAlert("Error", "We're sorry, but you can only upload images (.png .jpg .jpeg .gif), text (.txt), PDFs (.pdf), and XML files (.xml .mxl).");
         $inputFiles.replaceWith($inputFiles.clone(true));
       }
       else {
diff --git a/web/app/assets/javascripts/scheduled_session.js b/web/app/assets/javascripts/scheduled_session.js
index 779855bcf..d7da3b8c4 100644
--- a/web/app/assets/javascripts/scheduled_session.js
+++ b/web/app/assets/javascripts/scheduled_session.js
@@ -975,7 +975,7 @@
       var error = false;
       for (var i = 0; i < files.length; ++i) {
         var name = files.item(i).name;
-        var ext = name.split('.').pop();
+        var ext = name.split('.').pop().toLowerCase();
         if ($.inArray(ext, ["pdf", "png", "jpg", "jpeg", "gif", "xml", "mxl", "txt"]) == -1) {
           error = true;
           break;
@@ -984,7 +984,7 @@
       }
 
       if (error) {
-        app.notifyAlert("Error", "You can only upload images (.png .jpg .jpeg .gif), PDFs (.pdf), and XML files (.xml .mxl).");
+        app.notifyAlert("Error", "We're sorry, but you can only upload images (.png .jpg .jpeg .gif), text (.txt), PDFs (.pdf), and XML files (.xml .mxl).");
         $inputFiles.replaceWith($inputFiles.clone(true));
       }
       else {
diff --git a/web/app/assets/javascripts/sessionSettingsDialog.js b/web/app/assets/javascripts/sessionSettingsDialog.js
index 041ee32dd..3f0f5ab71 100644
--- a/web/app/assets/javascripts/sessionSettingsDialog.js
+++ b/web/app/assets/javascripts/sessionSettingsDialog.js
@@ -121,7 +121,7 @@
       var error = false;
       for (var i = 0; i < files.length; ++i) {
         var name = files.item(i).name;
-        var ext = name.split('.').pop();
+        var ext = name.split('.').pop().toLowerCase();
         if ($.inArray(ext, ["pdf", "png", "jpg", "jpeg", "gif", "xml", "mxl", "txt"]) == -1) {
           error = true;
           break;
@@ -130,7 +130,7 @@
       }
 
       if (error) {
-        app.notifyAlert("Error", "We're sorry, but we do not allow upload of that file type. Please upload only the file types listed in the Upload dialog box.");
+        app.notifyAlert("Error", "We're sorry, but you can only upload images (.png .jpg .jpeg .gif), text (.txt), PDFs (.pdf), and XML files (.xml .mxl).");
         $inputFiles.replaceWith($inputFiles.clone(true));
       }
       else {