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Code:

server {
listen 443 ssl http2;
listen [::]:443 ssl http2;

server_name jellyfin.*;

include /config/nginx/ssl.conf;

client_max_body_size 0;

location / {
include /config/nginx/proxy.conf;
include /config/nginx/resolver.conf;
set $upstream_app jellyfin;
set $upstream_port 8096;
set $upstream_proto http;
proxy_pass http://10.0.0.94:8096;

proxy_set_header Range $http_range;
proxy_set_header If-Range $http_if_range;
}

location ~ (/jellyfin)?/socket {
include /config/nginx/proxy.conf;
include /config/nginx/resolver.conf;
set $upstream_app jellyfin;
set $upstream_port 8096;
set $upstream_proto http;
proxy_pass http://10.0.0.94:8096;

}
}

Are you using SWAG? This looks similar to my config that was originally a template. I'm wondering why you're invoking "set" and then specifying an IP below? The upstream_app variable can be used to set the IP address, but I don't think that's the issue. Sharing portions of my config because they're different than yours. My root location block includes:

Code:

location / {
        include /config/nginx/proxy.conf;
        include /config/nginx/resolver.conf;
        set $upstream_app $jellyfin;
        set $upstream_port 8096;
        set $upstream_proto http;
        proxy_pass $upstream_proto://$upstream_app:$upstream_port;

        proxy_set_header Range $http_range;
        proxy_set_header If-Range $http_if_range;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Protocol $scheme;
        proxy_set_header X-Forwarded-Host $http_host;

        # Disable buffering when the nginx proxy gets very resource heavy upon streaming
        proxy_buffering off;
    }

And my socket location block includes:

Code:

location ~ (/jellyfin)?/socket {
        include /config/nginx/proxy.conf;
        include /config/nginx/resolver.conf;
        set $upstream_app $jellyfin;
        set $upstream_port 8096;
        set $upstream_proto http;
        proxy_pass $upstream_proto://$upstream_app:$upstream_port;

        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Protocol $scheme;
        proxy_set_header X-Forwarded-Host $http_host;
    }

I don't see any headers for your socket location and the only other big one I see is proxy_buffering. You also should be aware that invoking http2 in the way you have is deprecated and should be revised to this:

Code:

server {
    listen 443 ssl;
    http2 on;

You may also try setting the client_max_body_size to something like 10M or 20M but I don't think that will make much (if any) difference. TDP can advise you better than I can...they helped me iron out the kinks in my own config...