fix

src/server.js

@@ -320,17 +320,24 @@ function start(opts) {
 
     const watcherData = chokidar.watch(path.join(options.paths.mbtiles, '*.mbtiles'),
         {
+          persistent: true
         });
     watcherData.on('all', (eventType, filename) => {
       if (filename) {
         let id = path.basename(filename, '.mbtiles');
-        console.log(`Data "${id}" added`);
 
-        if (eventType == "add") {
+        if (eventType === "add") {
+          console.log(`Data "${id}" added`);
           let item = {
             mbtiles: filename
           };
           addData(id, item);
+        } else if (eventType === "change") {
+          console.log(`Data "${id}" changed`);
+          let item = serving.data[id];
+          if (item) {
+            item.source.reInit();
+          }
         }
       }
     });