Airtable UpdateRow and UpdateRowNum - "Trouble Updating Row"

Thank you for your clarification. It is unfortunate that Airtable does not allow the upload of files programmatically in the attachment field (see this post and @tatiang comments).

Having said that, you can still use the UpdateRowNum to update the other fields (columns) in the row such as this

image

For the following table
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It will not work for the block UpdateRow.