TusUpload and mixed content call

[atomotic]

I have deployed a Manifold instance (using manifold-docker-build with v8.1.2-beta.1)

I got this error on texts/ingestions/new:

TusUpload.js:107 Mixed Content: The page at 'https://{my_domain}/backend/projects/1effd04d-b995-40c6-ae4c-0a7f1d446fd8/texts/ingestions/new' was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint 'http://{my_domain}/api/files/80153821c49a4852b7796dab113876d4'. This request has been blocked; the content must be served over HTTPS.

the ENV SSL_ENABLED=true is present

[manifold@leto manifold]$ docker compose exec client /bin/bash
root@d1ed3c9ba3aa:/opt/manifold/client# cat /opt/manifold/client/dist/manifold/www/browser.config.js
if (!window.process) window.process = {};
if (!window.process.env) window.process.env = {};
process.env.NODE_ENV = "production";
process.env.DOMAIN = "{my_domain}"
process.env.CLIENT_BROWSER_API_URL = "https://{my_domain}"
process.env.CLIENT_BROWSER_API_CABLE_URL = "https://{my_domain}/cable"
process.env.SSL_ENABLED = "1"
process.version = "v16.16.0"

But I think is not reaching this point https://github.com/ManifoldScholar/manifold/blob/master/client/src/global/components/form/TusUpload.js#L95

What should I investigate?

[atomotic]

To add some more context to this help request: the compose stack is starting correctly, all containers are running.

The manifold-nginx is listening on :4000, the host server has another nginx proxying everything to it.

This is the content of environment/manifold.env (the installation domain is visible here)

DOMAIN=leto.verser.info

#CLIENT_BROWSER_API_URL=https://leto.verser.info
#CLIENT_BROWSER_API_CABLE_URL=https://leto.verser.info/cable

SSL_ENABLED=true

API_PORT=3020
API_SOCKET=/manifold_sockets/manifold-api
API_CABLE_SOCKET=/manifold_sockets/manifold-cable

CLIENT_SERVER_SOCKET=/manifold_sockets/manifold-client
#CLIENT_SERVER_API_URL=http://api_rails:3020
NODE_ENV=production

ELASTICSEARCH_URL=http://elasticsearch:9200

CLIENT_SERVER_PROXIES=true
RAILS_ENV=production
RAILS_SECRET_KEY=xxxxxxxxxxxx
RAILS_DB_USER=postgres
RAILS_DB_PASS=
RAILS_DB_HOST=postgres
RAILS_DB_PORT=5432
RAILS_DB_NAME=manifold_production
RAILS_REDIS_URL=redis://redis:6379

Can you help me understand why the file upload js makes a plain http call?