curl --request POST \
--url https://sandbox.tight.com/v6/files/upload \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: multipart/form-data' \
--form file='@example-file' \
--form 'data={
"description": "Q1 2024 invoice",
"date": "2024-01-15",
"entityId": "btxn_28868401",
"notes": "Received from vendor on 2024-01-15",
"amount": 15000,
"customData": {
"internal_key": "some_internal_key",
"some_other_field": 23434
}
}'