Problems with Nextcloud behind Traefik


I'm running Unraid with docker containers installed from my docker-compose.
This is my docker-compose:

I set it all up, everything apparently is ok, I can access with my website.
Via the Upload UI, when I try to upload lfiles, for example 4 files, the files are created and everything is ok

But when I try to upload multiple file (usually this happens when trying to upload 6 files or more), nextcloud just stops and starts throwing errors.

When I access directly to the IP address of the Web UI, I can upload as many files as I want with any problem, so I think this has something to do with Traefik configuration...

Can anyone help me with this? Thank you in advance!

I troubleshot a similar problem once with another reverse proxy.

But you really need to post the errors and logging on both traefik and nextcloud if you want help. And tcpdump a working connection versus a non-working and find what's different.