File plugin

Hello,
I am trying to use File Plugin (File API Plugin for Read and Write File Access on Devices) to open a local file in my project (the file is located in assets folder).

app.module.ts

(...)

// File Plugin
import { File } from '@ionic-native/file/ngx';

@NgModule({
  declarations: [AppComponent],
  entryComponents: [],
  imports: [BrowserModule, IonicModule.forRoot(), AppRoutingModule],
  providers: [{ provide: RouteReuseStrategy, useClass: IonicRouteStrategy },
    File],
  bootstrap: [AppComponent],
})
export class AppModule {}

tab1.page.ts

import { File } from '@ionic-native/file/ngx';
(...)

  constructor(
(...)
    private file: File) {}

  openLocal(){
    let filePath = this.file.applicationDirectory';

    console.log(filePath);
    
  }

tab1.page.html

(...)

  <ion-button expand="full" (click)="openLocal()">Open PDF</ion-button>
(....)

Console returns NULL for “filePath” (this.file.applicationDirectory’).

I am using:

Ionic CLI : 5.4.16
Ionic Framework : @ionic/angular 6.0.1
@angular-devkit/build-angular : 13.0.4
@angular-devkit/schematics : 13.0.4
@angular/cli : 13.0.4
@ionic/angular-toolkit : 5.0.3

Capacitor:

Capacitor CLI : 3.3.3
@capacitor/core : 3.3.3

Utility:

cordova-res (update available: 0.15.4) : 0.15.3
native-run : 1.5.0

System:

NodeJS : v16.13.1
npm : 8.1.2
OS : macOS Monterey

I will be grateful for your comments.

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