Upload a file

curl --request PUT \
  --url https://api.raccoonai.tech/chats/media/upload \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file'

{
  "key": "<string>",
  "size": 123,
  "contentType": "<string>",
  "filename": "<string>",
  "uploadedAt": "2023-11-07T05:31:56Z"
}