Dropbox --> Airtable , wrong filtype

I’m trying to use Dropbox as intermediary file system to get PDF attachments from Gmail into Airtable, using Integromat. Have had a long struggle trying to use GDrive as the intermediary system, which unfortunately does not work reliably.

With Dropbox as stepping-stone, it seems I can reliably get a file into Airtable (hurray!) but the file lands as application/binary rather than application/pdf which causes other problems for me - Airtable does not generate thumbnail image, and some of my downstream automations do not work because they think the filetype is wrong.

All these files have .pdf in file name, and Dropbox does correctly recognise these files as PDF in its native interface.

How can I make Airtable know that these file attachments are PDFs?

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