Merge API doesn't save PDF checkboxes


I have a PDF form, which has fields and checkboxes. When I filled form I’m sending document to the merge API. The pdf that I get from your server does have the fields filled out, but the checkboxes are not checked.
Can you please tell me what is the issue and how I can resolve this problem?

Thank you,

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Hi there - in the future please fill out the issue template correctly.

Which version of express are you using? Does this only happen with a specific document? If so, please share the document with me if possible. Can you send a code snippet showing how you are using the rest api?