If it's just a matter of renaming, I recommend this must-have plugin.
Use the release for Elgg version you're running.
Just look for the Elgg tab in the "Recommended Releases" section when downloading the plugin.
1 - Download My plugin (Currently only available for Elgg 5, but I will release a version for Elgg 6 in a few hours.)
2 - Open \my_plugin\elgg-plugin.php and after
'bootstrap' => \MyPlugin\Bootstrap::class, // for more options
add this section:
'actions' => [
'discussion/save' => [
'access' => 'admin',
],
'file/upload' => [
'access' => 'admin',
],
],
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