I’m trying to create a new document in lucidchart by importing a .lucid file. I am using the demo.lucid file. I have also tried creating my own .lucid file. I cannot figure out what I am doing wrong. Everything seems to match the instructions at https://lucid.readme.io/reference/createorcopyorimportdocument
The error :
"code": "invalidImportType",
"message": "Importing the provided file type is not supported"
Here is my Curl:
curl --location 'https://api.lucid.co/documents' \
--header 'authorization: Bearer oauth2-...8sKF' \
--header 'lucid-api-version: 1' \
--form 'product="lucidchart"' \
--form 'title="helloform"' \
--form '=@"/C:/Users/USER/Downloads/demo (1).lucid"'
Here is a screenshot

Any advice is appreciated