How to open a PDF File from Blob with Ionic FileOpener and Capacitor

In my Ionic 5 project I have a PDF downloaded to the device (physical iPhone Pro, iOS simulators as well as Android devices). Transformed to Base64 and stored as .txt file. I'm retrieving the file as following:

const options = {
  path: path,
  directory: FilesystemDirectory.Data,
  encoding: FilesystemEncoding.UTF8
}

Filesystem.readFile(options)
  .then(result => {

    const jsonCast = JSON.parse(result.data)
    const blop: Blob = this.convertBase64ToBlob(jsonCast)
    resolve(blop)
})

The next step in my code is to get the URL of the Blob file:

const fileURL = URL.createObjectURL(blob)

Now tho with Ionic native's FileOpener, when I try to open the File by using:

this.fileOpener.open(blobURL, 'application/pdf')

I get the error message, that the File does not exist.

⚡️  [log] - fileURL:  blob:capacitor://localhost/ff4efd06-a313-44ce-b386-c756d456e72f   
2019-09-23 17:06:19.267144-0700 App[25791:19944973] Path parameter not encoded. Building file URL encoding it...
2019-09-23 17:06:19.267326-0700 App[25791:19944973] looking for file at blob:capacitor:/localhost/ff4efd06-a313-44ce-b386-c756d456e72f -- file:///
⚡️  [log] - Error opening file {"status":"9","message":"File does not exist"}  

What I am missing or what's a better approach to store a PDF File to the hard phone and retrieve then load and display it? I have tried pushing it to the Safari browser, but the plugin expects a https URL and catches as well.

Any help is highly appreciated.

PS: As mentioned in my question, I'm building the App with Capacitor. Therefore I'm limited as to what cordova plugins I'm able to use. Thank you for considering that in your help.

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