reverse proxies have upload limits, too - fixes #22

content/en/docs/install/faqs.md

@@ -67,3 +67,16 @@ that](https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image#web_s
 
 It's probably a caching issue. Look at [the update
 instructions](../fresh/#caching-issues).
+
+## How do I upload large files to the drive?
+
+The default value for the `maxFileSize` configuration setting is
+262144000 (250MiB). If you want to upload files larger than that, you
+should change your configuration file accordingly.
+
+If you're trying to upload files smaller than that limit, and still
+get errors saying the file is too large, it's probable that the
+reverse proxy in front of your Sharkey has its own limit. For example,
+[nginx has
+`client_max_body_size`](https://nginx.org/en/docs/http/ngx_http_core_module.html#client_max_body_size)
+which defaults to only 1MB. You'll need to change that.