You can use altering view input hook in your plugin, e.g. for 'object/elements/full/attachments'

elgg_register_plugin_hook_handler('view_vars', 'object/elements/full/attachments', 'add_text', 100);

function add_text(\Elgg\Hook $hook) {
    $vars = $hook->getValue();

    $entity = elgg_extract('entity', $vars);
    
    if (!$entity instanceof \ElggEntity) {
     return;
    }

    $attachments = elgg_extract('attachments', $vars);

    $attachments .= 'Contact me if you have a question';

    $vars['attachments'] = $attachments;

   return $vars;
}

Thanks Nikolai and Daviesmolly for getting involved. I'll leave it up to y'all as it's way over my head.

Thanks again

What I did do is create the html (because I wanted it bold/italics/red) of the recurring message I wanted to appear on all posts and saved it to a text editor file which I placed on my desktop and simply copy/pasted it on the create/edit screen in html mode. VIOLA done.

no solution for this tiny little problem?

Thanks again!

Bingo!! Absolutely great plugin

Tested on https://seochecker.it/pwa-tester-online Result 100% PWA ready

Sometimes developers don't have enough time to publish their plugins here, or they don't want to do it for some reason.

Time is our most common reason for forgetting to publish on the community ;)