Hi @solutomn,
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AWS Textract service works in synchronous mode for PNG or JPEG files only, e.g. a request is sent and the response comes right away within the same action.
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It is possible to use PDF files in asynchronous mode (a request is sent, processed by AWS, and the response is retrieved after the requestor checks the job completion status), requiring you own an AWS S3 storage, use AWS Queue and Notifications to get notified, which adds a layer of complexity.
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You can find an example of an asynchronous AWS request for another plugin in this editor. Should you require this implementation, we would be happy to investigate this possibility for you.