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Editorial Team
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Asked: 2026-05-28T15:22:15+00:00

I’m attempting to attach a file to a comment in a message with the

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I’m attempting to attach a file to a comment in a message with the Basecamp API. According to the documentation, I first upload the file as so:

curl -H 'Accept: application/xml' -H 'Content-Type: application/octet-stream' -u 123456789:X -X POST -d @/my/path/test.txt https://myurl.com/upload

This returns an id, so I know the file was uploaded. I then try to attach this file to a comment in a message:

curl -H 'Accept: application/xml' -H 'Content-Type: application/xml' -u 123456789:X -X POST -d '<comment><body>This is a test</body><attachments><name>blah</name><file><file>$id</file><content-type>application/text</content-type><original-filename>test.txt</original-filename></file></attachments></comment>' https://myurl/posts/987654321/comments.xml

The comment is uploaded however the attachment is not. Does anyone know why the attachment would not be uploaded?

Thanks

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1 Answer

  1. Editorial Team

    I’m not sure if it’s your only problem, but the value of $id isn’t interpolated when you use single quotes, and so you’re passing the string '$id' instead of the value of $id.

    Either use '...<file>'$id'</file>...' or "...<file>$id</file>..."

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