feat: files go in 4 MB pieces, several at once and each retried on its own, so they pass a proxy like Cloudflare and survive a bad link (0.0.8)

deploy/nginx.conf.example

@@ -21,9 +21,9 @@ server {
     include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
     ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
 
-    # Files go through the panel as plain request bodies, up to 512 MB each
-    # way (an upload from the browser, a download sent up by the agent).
-    client_max_body_size 520m;
+    # Files go through the panel in 4 MB pieces; 64m leaves room for a client
+    # older than 0.0.8, which takes a file of up to 32 MB in one request.
+    client_max_body_size 64m;
 
     location / {
         proxy_pass http://127.0.0.1:8091;