Airtable Not Recognizing Downloaded Google Doc

I've generated a Google Doc from a template using the "Create a Document from a Template" module in callin.io. The data for this document originates from a stock market API, and each document contains a summary of the data retrieved from the API service.

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My objective is to transfer this Google Doc into an Airtable attachment field as a PDF. The corresponding Airtable record would reference the same stock symbol as the Google Doc, and this specific Airtable record is linked earlier in my callin.io sequence.

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I'm encountering an issue where Airtable doesn't easily map the Google Doc from the Google Docs module "Download a Document." I have configured my Google Doc to download as a PDF.

When I attempt this with other applications, including Slack, Dropbox, Google Drive, and OneDrive, the mapping is straightforward. However, with Airtable, it displays the output from the "Download a Document" module as the filename I assigned to the Google Doc, followed by a field named "Data" containing a long string of alphanumeric characters. Airtable fails to recognize this string, resulting in an error within callin.io that requires a file URL for uploading the PDF.

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I've attempted to use the "content download URL" data field from the source Google Doc, but I consistently receive an error related to access permissions. This is because the Google Doc is not publicly shared, and as I understand it, Airtable requires a public URL to access the file.

I've been employing a workaround that involves uploading the downloaded Google Doc to OneDrive. From there, it maps easily, and I can then manually map the OneDrive file to the Airtable attachment field. While this method is functional, I'm looking for a more streamlined process that avoids downloading the document, uploading it to a secondary service, and then retrieving it from that service to import into Airtable.

My primary question seeking an answer is:
_Is there a more efficient method to map files from the Google Docs "Download a Document" module to an Airtable data field using the Airtable "Update a Record" module?

This setup involves a paid Google Workspace account, a paid OneDrive for Business account, and the Airtable Business plan.