File input via the API stopped working

I have a JAMStack site that creates entries to GF via the API. The form has a bunch of different fields including two file fields that take one PDF file each. These have been working for month without issues.

Yesterday we migrated the backend from one server to another, and now the API returns an error saying the file input needs to be filled since they are mandatory, even though they are already filled.

I checked the http request and I can clearly see the field being sent correctly there, so I’m not sure what to do now.

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