AutoML prediction model PDF extraction: Required field not set - node.js

Question

I'm trying to perform entity extraction on my prediction model but having issues passing PDF document from GCS.
/**
* TODO(developer): Uncomment these variables before running the sample.
*/
const projectId = "id";
const location = "us-central1";
const modelId = "modelid";
const keyFilename = "./gcp.json";
// Imports the Google Cloud AutoML library
const { PredictionServiceClient } = require("#google-cloud/automl").v1;
// Instantiates a client
const client = new PredictionServiceClient({ keyFilename });
async function predict() {
// Construct request
const request = {
name: client.modelPath(projectId, location, modelId),
payload: {
document: {
input_config: {
gcs_source: {
input_uris: "gs://pathtofile.pdf",
},
},
},
},
};
const [response] = await client.predict(request);
for (const annotationPayload of response.payload) {
console.log(annotationPayload);
console.log(`Text Extract Entity Types: ${annotationPayload.displayName}`);
console.log(`Text Score: ${annotationPayload.textExtraction.score}`);
const textSegment = annotationPayload.textExtraction.textSegment;
console.log(`Text Extract Entity Content: ${textSegment.content}`);
console.log(`Text Start Offset: ${textSegment.startOffset}`);
console.log(`Text End Offset: ${textSegment.endOffset}`);
}
}
predict();
This gives the following error:
Error: 3 INVALID_ARGUMENT: List of found errors: 1.Field: payload.document.document_text.content; Message: Required field not set.
code: 3,
details: 'List of found errors:\t1.Field: payload.document.document_text.content; Message: Required field not set.\t',
metadata: Metadata {
internalRepr: Map(3) {
'grpc-server-stats-bin' => [
Buffer(10) [Uint8Array] [
0, 0, 183, 198, 95,
1, 0, 0, 0, 0
]
],
'google.rpc.badrequest-bin' => [
Buffer(67) [Uint8Array] [
10, 65, 10, 38, 112, 97, 121, 108, 111, 97, 100,
46, 100, 111, 99, 117, 109, 101, 110, 116, 46, 100,
111, 99, 117, 109, 101, 110, 116, 95, 116, 101, 120,
116, 46, 99, 111, 110, 116, 101, 110, 116, 18, 23,
82, 101, 113, 117, 105, 114, 101, 100, 32, 102, 105,
101, 108, 100, 32, 110, 111, 116, 32, 115, 101, 116,
46
]
],
'grpc-status-details-bin' => [
Buffer(222) [Uint8Array] [
8, 3, 18, 104, 76, 105, 115, 116, 32, 111, 102, 32,
102, 111, 117, 110, 100, 32, 101, 114, 114, 111, 114, 115,
58, 9, 49, 46, 70, 105, 101, 108, 100, 58, 32, 112,
97, 121, 108, 111, 97, 100, 46, 100, 111, 99, 117, 109,
101, 110, 116, 46, 100, 111, 99, 117, 109, 101, 110, 116,
95, 116, 101, 120, 116, 46, 99, 111, 110, 116, 101, 110,
116, 59, 32, 77, 101, 115, 115, 97, 103, 101, 58, 32,
82, 101, 113, 117, 105, 114, 101, 100, 32, 102, 105, 101,
108, 100, 32, 110,
... 122 more items
]
]
},
options: {}
},
statusDetails: [
BadRequest {
fieldViolations: [
FieldViolation {
field: 'payload.document.document_text.content',
description: 'Required field not set.'
}
]
}
]
}
I have checked all the passed parameters and they're fine.
I'm using this as an example: https://cloud.google.com/natural-language/automl/docs/predict#automl_language_entity_extraction_predict-nodejs
It works fine when I pass text but I would like to pass PDF as the payload.
Thank you