rewriting URL of /assets/img/tld_logos

[Walther]

In /assets/img/tld_logos there're a lot of .png files with various TLD logos.

To use them in different pages (also outside of WHMCS), I would like to make them accessible by a different, shorter and easier to remeber URL, such as /tld_logos/ 

So I tried to insert in .htaccess following command:

Options +FollowSymLinks
RewriteEngine On
RewriteRule ^tld_logos/(.*)$ https://mywhmcsdomain.com/assets/img/tld_logos/$1 [R=301,L]

but it doesn't work, and trying to access (i.e.) mywhmcsdomain/tldlogos/blog.png I'm getting just a 404 error ... 😞

In .htaccess there're just the "standard" WHMCS commands:

### BEGIN - WHMCS managed rules - DO NOT EDIT BETWEEN WHMCS MARKERS ###
<IfModule mod_rewrite.c>
RewriteEngine on

# RewriteBase is set to "/" so rules do not need updating if the
# installation directory is relocated.  It is imperative that
# there is also a RewriteCond rule later that can effectively get
# the actual value by comparison against the request URI.
# 
# If there are _any_ other RewriteBase directives in this file,
# the last entry will take precedence!
RewriteBase /

# Redirect directories to an address with slash
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^(.+[^/])$  $1/ [R]

# Send all remaining (routable paths) through index.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
# Determine and use the actual base
RewriteCond $0#%{REQUEST_URI} ([^#]*)#(.*)\1$
RewriteRule ^.*$ %2index.php [QSA,L]
</IfModule>
### END - WHMCS managed rules - DO NOT EDIT BETWEEN WHMCS MARKERS ###

What am I doing wrong?