Index: lams_central/web/qb/importQuestionsXml.jsp
===================================================================
diff -u -rf92b1383638a766c5d8496c6f607322dd2af8329 -r0559504eae34958a1b85105cedeff10e591a52cf
--- lams_central/web/qb/importQuestionsXml.jsp	(.../importQuestionsXml.jsp)	(revision f92b1383638a766c5d8496c6f607322dd2af8329)
+++ lams_central/web/qb/importQuestionsXml.jsp	(.../importQuestionsXml.jsp)	(revision 0559504eae34958a1b85105cedeff10e591a52cf)
@@ -50,24 +50,35 @@
 	 		UPLOAD_FILE_MAX_SIZE = '<c:out value="${UPLOAD_FILE_MAX_SIZE}"/>';
 			
 		function initFileUpload(tmpFileUploadId, language) {
-			  var uppyProperties = {
-				  // upload immediately 
-				  autoProceed: true,
-				  allowMultipleUploads: true,
-				  debug: false,
-				  restrictions: {
-					// taken from LAMS configuration
-				    maxFileSize: +UPLOAD_FILE_MAX_SIZE,
-				    maxNumberOfFiles: 1,
-				    allowedFileTypes : ['.xml']
-				  },
-				  meta: {
-					  // all uploaded files go to this subdir in LAMS tmp dir
-					  // its format is: upload_<userId>_<timestamp>
-					  'tmpFileUploadId' : tmpFileUploadId,
-					  'largeFilesAllowed' : true
-				  }
-			  };
+			var allowedFileTypes = ['.xml'],
+		  	  	uppyProperties = {
+					  // upload immediately 
+					  autoProceed: true,
+					  allowMultipleUploads: true,
+					  debug: false,
+					  restrictions: {
+						// taken from LAMS configuration
+					    maxFileSize: +UPLOAD_FILE_MAX_SIZE,
+					    maxNumberOfFiles: 1,
+					    allowedFileTypes : allowedFileTypes
+					  },
+					  meta: {
+						  // all uploaded files go to this subdir in LAMS tmp dir
+						  // its format is: upload_<userId>_<timestamp>
+						  'tmpFileUploadId' : tmpFileUploadId,
+						  'largeFilesAllowed' : true
+					  },
+					  onBeforeFileAdded: function(currentFile, files) {
+						  var name = currentFile.data.name,
+						  	  extensionIndex = name.lastIndexOf('.'),
+						  	  valid = allowedFileTypes.includes(name.substring(extensionIndex).trim());
+						  if (!valid) {
+							  uppy.info('<fmt:message key="error.import.file.format" />', 'error', 10000);
+						  }
+						  
+						  return valid;
+				    }
+				  };
 			  
 			  switch(language) {
 			  	case 'es' : uppyProperties.locale = Uppy.locales.es_ES; break; 
@@ -92,6 +103,10 @@
 				  height: 120,
 				  width: '100%'
 				});
+
+			  uppy.use(Uppy.Informer, {
+				  target: '#image-upload-area'
+			  });
 			  
 			  uppy.use(Uppy.StatusBar, {
 				  target: '#image-upload-area',