Support for Textract async uploads

[meketadev]

Describe the bug
After installing the predictions plugin to identify text for documents, and uploading a PDF, an error occurs: "Error: Unsupported document format".

To Reproduce
With a new ionic project
ionic start blank (add main and polyfill code)
amplify init
amplify add auth (defaults)
amplify add predictions -> identify -> Identify Text -> "Would you also like to identify documents?" Yes -> Auth and Guest users

try to identify a pdf
see error

import { Component } from '@angular/core';
import Predictions from '@aws-amplify/predictions';

@Component({
  selector: 'app-home',
  templateUrl: 'home.page.html',
  styleUrls: ['home.page.scss'],
})
export class HomePage {

  constructor() {}
  
  onFileChange(event) {
    const file = event.target.files[0];
    console.log(file)
    Predictions.identify({
      text: {
        source: {
          file
        },
        format: "ALL"
      }
    }).then(event => {
      console.log(event)
    })
  }

  
}

Expected behavior
Textract has an async function (start_document_analysis) for dealing with pdfs. I do not believe the current implementation allows for this. However, the "Would you also like to identify documents?" option seems like a question to allow for this.

Additional context
I'm not sure if this is creating a lambda function to handle the function. I can't seems to find the resource to switch to the async function.

[elorzafe]

@meketadev Predictions category currently supports synchronous operations for Amazon Textract.

That question from Amplify CLI you mentioned Would you also like to identify documents?is basically for enabling Amazon Textract that allows detecting document like images (picture from a document that contains multiple words) rather than a street sign or images that contains a small number of words.

[manueliglesias]

@meketadev

We'll be flagging this as a feature request, at the moment, Amplify's predictions support for text recognition only works with the synchronous operations as you pointed out.

[boogietimeproductions]

Any update on this request?

the wording of the documentation is somewhat confusing: https://docs.amplify.aws/lib/predictions/identify-text/q/platform/js

"Services used: Amazon Rekognition (default for plain text) and Amazon Textract (default for documents)"

[lucasforbes]

Any update on being able to upload PDFs via amplify Predictions?

[DarylBeattie]

I really wish this worked, but seeing as it looks like a very simple fix and it's been 3.5 years, I suppose we shouldn't hold our breath.

I guess the best course of action here is to update the documentation to say it isn't supported, so that others are not led down the wrong path.