fembooru/themes/material/upload.theme.php

<?php declare(strict_types=1);

class CustomUploadTheme extends UploadTheme
{
    // public function display_block(Page $page) {
    // 	$page->add_block(new Block("Upload", $this->build_upload_block(), "left", 20));
    // }
  //
    // public function display_full(Page $page) {
    // 	$page->add_block(new Block("Upload", "Disk nearly full, uploads disabled", "left", 20));
    // }
}