flow/docs/versioned_docs/version-1.9.0/API-Reference/curl-examples/api-files/send-files-to-your-flows-v2.sh

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
DEFAULT_UPLOAD_FILE="$SCRIPT_DIR/../../fixtures/sample-upload.txt"
UPLOAD_FILE="${SAMPLE_UPLOAD_FILE:-$DEFAULT_UPLOAD_FILE}"

curl -X POST \
  "$FLOW_URL/v1/files" \
  -H "accept: application/json" \
  -H "Content-Type: multipart/form-data" \
  -H "x-api-key: $FLOW_API_KEY" \
  -F "file=@${UPLOAD_FILE}"