Index: lams_admin/web/import/importGroups.jsp
===================================================================
diff -u -r0559504eae34958a1b85105cedeff10e591a52cf -rbc66c534c18e8e49ce8ed510418400cbc56fd605
--- lams_admin/web/import/importGroups.jsp	(.../importGroups.jsp)	(revision 0559504eae34958a1b85105cedeff10e591a52cf)
+++ lams_admin/web/import/importGroups.jsp	(.../importGroups.jsp)	(revision bc66c534c18e8e49ce8ed510418400cbc56fd605)
@@ -69,17 +69,7 @@
 						  // 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.attachment.not.xls" />', 'error', 10000);
-						  }
-						  
-						  return valid;
-				    }
+					  }
 				  };
 			  
 			  switch(language) {