Appflow build fails with native plugin Camera and File

Hi all,
I have my app configured and running with appflow. All works fine until I added 2 native plugins Camera and File.
Now when I’m going to run a build I always got this error:

[09:06:15]: ▸ ERROR in app/app.module.ts:14:20 - error TS2307: Cannot find module '@ionic-native/File/ngx'.
[09:06:15]: ▸ 14 import {File} from '@ionic-native/File/ngx';
[09:06:15]: ▸                       ~~~~~~~~~~~~~~~~~~~~~~~~
[09:06:15]: ▸ app/app.module.ts:54:22 - error TS2307: Cannot find module '@ionic-native/Camera/ngx'.
[09:06:15]: ▸ 54 import {Camera} from '@ionic-native/Camera/ngx';
[09:06:15]: ▸                         ~~~~~~~~~~~~~~~~~~~~~~~~~~
[09:06:15]: ▸ app/pages/profile/digital-signature/digital-signature-upload-doc/digital-signature-upload-doc.page.ts:2:56 - error TS2307: Cannot find module '@ionic-native/Camera/ngx'.
[09:06:15]: ▸ 2 import {Camera, CameraOptions, PictureSourceType} from '@ionic-native/Camera/ngx';
[09:06:15]: ▸                                                          ~~~~~~~~~~~~~~~~~~~~~~~~~~
[09:06:15]: ▸ app/pages/profile/digital-signature/digital-signature-upload-doc/digital-signature-upload-doc.page.ts:5:20 - error TS2307: Cannot find module '@ionic-native/File/ngx'.
[09:06:15]: ▸ 5 import {File} from '@ionic-native/File/ngx';

It seems like the npm install doesn’t download these 2 plugins.

Obviously the package.json contains that and all works fine locally.

Anyone could help me?

Thanks
Fabrizio