How to check the directory in ionic 4

Ionic Framework
1

I am using ionic 4, I want to check the file have inside my phone storage or not. If the file already inside the phone, I want to direct open the file no need download again my file, else I want to download the file. Can I know how to do it?

Here is my download file coding.

    this.http.get('API_URL')
    .subscribe((res) => {
      const fileName = this.name;

      this.file.writeFile(this.file.externalRootDirectory + 'Download/', fileName, res);
    });
  });

Anyone can help me? Thank you very much

2

You can try this approach

Good luck!

3

In addition

For native storage access like sd card erc you need cordova or capacitor

Stuff in your src/assets folder can be accessed with http

4

if possible can give me coding?