Send back only new files on upload.

package.json

@@ -11,11 +11,10 @@
     "build": "tsc -p ."
   },
   "dependencies": {
-    "@types/multer": "^1.4.7",
     "axios": "^0.24.0",
     "bluebird": "^3.7.2",
     "body-parser": "^1.20.0",
-    "cors": "2.8.5",
+    "cors": "^2.8.5",
     "dotenv": "10.0.0",
     "express": "^4.17.3",
     "file-type": "^16.5.3",
@@ -28,6 +27,8 @@
     "winston-daily-rotate-file": "^4.6.1"
   },
   "devDependencies": {
+    "@types/multer": "^1.4.7",
+    "@types/cors": "^2.8.12",
     "@types/express": "^4.17.13",
     "@types/fs-extra": "^9.0.13",
     "@types/gm": "^1.18.11",