curl --request POST \
  --url https://ds.cominty.com/chat/files/upload \
  --header 'Content-Type: application/json' \
  --header 'x-cominty-token: <api-key>' \
  --data '
{
  "etag": "<string>",
  "key": "<string>"
}
'

{
  "id": "<string>",
  "name": "<string>",
  "size": 123,
  "mimetype": "<string>",
  "url": "<string>"
}