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When opening that PDF document in the API, I see the following error:
When the API detects unsuppported form fields, this dialog appears on the rendered PDF. So, this is likely the issue.
From the documentation (see below):
In the current version, following form fields are unsupported:
Digital Signature fields.
File picker text field
RTF (rich text) text field
Text field and drop downs with some special and custom formats
PDF Actions that includes button Submit scenarios (only button viewing is supported)
Here is the relavent documentation page link: https://opensource.adobe.com/pdfembed-sdk-docs/howtos_ui.html#forms-handling
There are also Digital Signature fields on the document. The error is probably related to those fields and not related to the checkboxes issue. We'll still take a look at the documentation.