Add custom upload name

package.json

@@ -1,7 +1,7 @@
 {
   "name": "grapesjs",
   "description": "Free and Open Source Web Builder Framework",
-  "version": "0.9.28",
+  "version": "0.9.29",
   "author": "Artur Arseniev",
   "license": "BSD-3-Clause",
   "homepage": "http://grapesjs.com",

src/asset_manager/config/config.js

@@ -10,6 +10,9 @@ module.exports =  {
   // upload: false,
   upload: 0,
 
+  // The name used in POST to pass uploaded files
+  uploadName: 'files',
+
   // Custom headers to pass with the upload request
   headers: {},
 

src/asset_manager/view/FileUploader.js

@@ -94,7 +94,7 @@ module.exports = Backbone.View.extend({
     const params = config.params;
 
     for (let i = 0; i < files.length; i++) {
-      body.append('files[]', files[i]);
+      body.append(`${config.uploadName}[]`, files[i]);
     }
 
     for (let param in params) {