Today I got this error when uploading a video to my WordPress site. I Googled around for a little bit, but the proposed solution wasn’t working.

It turns out that since I am using WordPress docker and a Nginx proxy, this later was complaining that the file was too large 413 Request Entity Too Large when the file was uploaded using the browser uploader, not the WordPress multi-file uploader.

The solution was easy:
$ vim nginx.conf

http {
...
# Added because uploading large files to WordPress is throwing HTTP error.
client_max_body_size 64M;
...

In my case since I want my setting to take place for all the websites I am hosting with Nginx I applied the setting under the http section.

Enjoy