Add memory (from files)

curl --request POST \
  --url https://api.circlemind.co/graph/{graph_name}/files \
  --header 'Content-Type: multipart/form-data' \
  --header 'apiKey: <api-key>' \
  --form 'files=[
  null
]'

{
  "requestId": "<string>",
  "requestTime": 123,
  "memoryId": "<string>"
}