Time in filename

Actually you can’t unless you change the plugin code.
The time is there to avoid having files with the exact same filename.

Ah ok that makes sense. If I was to change the code, what would I change?

You have 2 options:
1. This is the recommented.
In your custom.php or theme functions.php
use the following:

remove_filter('bp_group_documents_filename_in', 'bp_group_documents_prepare_filename');
add_filter('bp_group_documents_filename_in', 'your_function_for_prepare_filename');

function your_function_for_prepare_filename($file){
$file = SOMETHING INSTEAD OF TIME() . '-' . $file;
    $file = preg_replace('/[^0-9a-zA-Z-_.]+/', '', $file);
    return $file;
}

2. NOT Recommended because in the next plugin update you will lose the change.
Plugin’s file /includes/filters.php
in function bp_group_documents_prepare_filename()
line 15 change the time()
$file = time() . '-' . $file;
to what ever you want.

Bests Lena

Thanks for that