Cant upload files by shared link

Hi.
I am trying to share some folder with upload rights to someone. Link created successfully but when I try to upload file by this link I am receiving “network error”. When I’ve tried to do the same with chrome development tools I see that firstly browser tried to go to some https link and then to the unsecured http port 8082, second operation fails.
Server 7.1.4, browser Chrome.
Nginx config:

    cat /etc/nginx/conf.d/seafile.conf
server {
    server_name *******; # managed by Certbot
        root         /usr/share/nginx/html;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

#TRICK FOR CORRECT WORKING OF SVNs COPY and MV METHODS READ MORE HERE: http://mailman.nginx.org/pipermail/nginx-ru/2016-August/058844.html

        set $fixed_destination $http_destination;

        if ($http_destination ~* ^https(?<foo>.*)$)
        {
                set $fixed_destination http$foo;
        }

#TRICK FOR CORRECT WORKING OF SVNs COPY and MV METHODS

        client_max_body_size 10G; # for uploading big files to the SVN server

        location / {

         proxy_pass         http://127.0.0.1:8000;
        proxy_set_header   Host $host;
        proxy_set_header   X-Real-IP $remote_addr;
        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header   X-Forwarded-Host $server_name;
        proxy_set_header   X-Forwarded-Proto https;

        access_log      /var/log/nginx/seahub.access.log;
        error_log       /var/log/nginx/seahub.error.log;

        proxy_read_timeout  1200s;

        client_max_body_size 0;

        }

        location /seafhttp {
        rewrite ^/seafhttp(.*)$ $1 break;
        proxy_pass http://127.0.0.1:8082;
        client_max_body_size 0;
        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_connect_timeout  36000s;
        proxy_read_timeout  36000s;
        proxy_send_timeout  36000s;
        send_timeout  36000s;

        proxy_request_buffering off;

        }

        location /media {
        root /home/kt368/seafile/seafile-server-latest/seahub;
        }

        location /seafdav {
        proxy_pass   http://127.0.0.1:8080/seafdav;
        proxy_set_header   Host $host;
        proxy_set_header   X-Real-IP $remote_addr;
        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header   X-Forwarded-Host $server_name;
        proxy_set_header   X-Forwarded-Proto $scheme;
        client_max_body_size 0;
        proxy_connect_timeout  36000s;
        proxy_read_timeout  36000s;
        proxy_send_timeout  36000s;
        send_timeout  36000s;

        # This option is only available for Nginx >= 1.8.0. See more details below.
        proxy_request_buffering off;

        access_log      /var/log/nginx/seafdav.access.log;
        error_log       /var/log/nginx/seafdav.error.log;
        }

        error_page 404 /404.html;
            location = /40x.html {
        }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }
        location /repos {
                proxy_pass  http://127.0.0.1:83/repos/;
                proxy_set_header    Host            $host;
                proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header        Destination     $fixed_destination;

        }


    listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/*******/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/*******/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot



}

Do files will sent securely? Is it okay, that browser tried to use unsecured http connection? How to fix it?

Wrong SERVICE_URL and/or file server root