Increase request max length in Retool server back end

https-portal:
image: tryretool/https-portal:latest
ports:
- "80:80"
- "443:443"
links:
- api
restart: always
env_file: ./docker.env
environment:
STAGE: "local" # <- Change 'local' to 'production' to use a LetsEncrypt signed SSL cert
CLIENT_MAX_BODY_SIZE: 40M
KEEPALIVE_TIMEOUT: 605
PROXY_CONNECT_TIMEOUT: 600
PROXY_SEND_TIMEOUT: 600
PROXY_READ_TIMEOUT: 600
networks:
- frontend-network

I got an error when sending a large base64 csv file to the GRPC server.
When looking at the log, I noticed that Retool's backend server canceled the request because it was too large.
Can I increase this limit?

By the way, is there any way to call GRPC resources from Retool directly without having to go through Retool's backend server?