AssetManager: Configurable upload name suffix for multi file uploads (#5672)

add multiUploadSuffix config to AssetManager

src/asset_manager/config/config.ts

@@ -46,10 +46,15 @@ export interface AssetManagerConfig {
    */
   credentials?: RequestCredentials;
   /**
-   * Allow uploading multiple files per request. If disabled filename will not have '[]' appended.
+   * Allow uploading multiple files per request. If disabled filename will not have the 'multiUploadSuffix' appended.
    * @default true
    */
   multiUpload?: boolean;
+  /**
+   * The suffix to append to 'uploadName' when 'multiUpload' is true.
+   * @default '[]'
+   */
+  multiUploadSuffix?: string;
   /**
    * If true, tries to add automatically uploaded assets. To make it work the server should respond with a JSON containing assets in a data key, eg:
    * { data: [ 'https://.../image.png', {src: 'https://.../image2.png'} ]
@@ -146,6 +151,7 @@ const config: AssetManagerConfig = {
   params: {},
   credentials: 'include',
   multiUpload: true,
+  multiUploadSuffix: '[]',
   autoAdd: true,
   customFetch: undefined,
   uploadFile: undefined,

src/asset_manager/view/FileUploader.ts

@@ -155,7 +155,7 @@ export default class FileUploaderView extends View {
 
     if (this.multiUpload) {
       for (let i = 0; i < files.length; i++) {
-        body.append(`${config.uploadName}[]`, files[i]);
+        body.append(`${config.uploadName}${config.multiUploadSuffix}`, files[i]);
       }
     } else if (files.length) {
       body.append(config.uploadName!, files[0]);