Decrease max upload file size

Hi all

Seems like everyone wants to increase the max file upload size, but I would like to decrease it. We’re running multisite and will only be using image uploads for thumbnails/featured image purposes to save on space (we have a lot of blogs).

Anyways, I set the max file size to 100kb, but when I tested uploading an image on a new blog post, it allowed me to upload a 2mb image.

Is there somewhere else I need to go to set the max upload size besides the Network Admin > Settings area?

Thanks much!