Experimenting with this and found that simply adding the .json file a config directory in the module seems to work, I assume the same might be true for themes.
This is a security precaution. It's not recommended and it's not documented in the settings.php file, but you can set allow_insecure_uploads to be TRUE if you wish to allow uploading files like...
You can create a small custom module using this hook:
https://github.com/backdrop-contrib/webform/blob/136c20cb1c51cea203f3f0bc5355237c1d4dbf84/webform.api.php#L652-L678
/**
* Determine...
Posted1 day 4 hours ago by Martin Price (yorkshirepudding) on:
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Experimenting with this and found that simply adding the .json file a config directory in the module seems to work, I assume the same might be true for themes.