Yes, attachments can be added and updated using the upsert endpoint but the "value" object for the field has a different shape than other data types. Instead of:
{ "6": { "value": base64EncodedFile }}it expects:
{ "6": { "value": { "fileName": "filename.pdf", "data": base64EncodedFile } } }
If you look at the file attachment section for the file type details (https://developer.quickbase.com/fieldInfo ) you'll find their example for the record create endpoint.
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Nathan Hawe
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