Returns info to preview a file

curl --request GET \
  --url https://api.smokeball.com/matters/{matterId}/documents/files/{fileId}/preview/{documentVersionId} \
  --header 'Authorization: <api-key>' \
  --header 'x-api-key: <api-key>'

{
  "fileId": "b471682e-fa17-4e46-b7fe-9b2b8fdcb3c2",
  "documentVersionId": "<string>",
  "downloadUrl": "",
  "expiry": "2022-04-23T14:30:00Z"
}