If you deleted the .htaccess code in the dlm_uploads folder you can re-add it. Below is the code that can be found in the file:
# Apache 2.4 and up
<IfModule mod_authz_core.c>
Require all denied
</IfModule>
# Apache 2.3 and down
<IfModule !mod_authz_core.c>
Order Allow,Deny
Deny from all
</IfModule>