How to Redirect URLs from One Domain to Another Using .htaccess with Specific Folder Preservation?

Question

I'm trying to set up redirection rules in my .htaccess file to redirect URLs from one domain to another while preserving a specific folder structure within the URL. Specifically, I want to redirect requests from www.example1.org/foldername/ to www.example2.org/foldername/, ensuring that the /foldername/ folder is maintained in the redirected URL.

I've tried using the following rewrite rule:

RewriteEngine On
RewriteCond %{HTTP_HOST} ^www\.example1\.org[NC]
RewriteRule ^example/(.*)$ https://www.example2.org/foldername/$1 [R=301,L]

However, when I test this rule, the redirection works but it seems to strip off the /example/ folder, resulting in redirected URLs like https://www.example2.org/wp-content/themes/stratusx-child/template/upload/202011191605847805585.png instead of https://www.example2.org/foldername/wp-content/themes/stratusx-child/template/upload/202011191605847805585.png.

How can I modify the rewrite rule to ensure that the /foldername/ folder is preserved in the redirected URL?

Any insights or alternative approaches would be greatly appreciated. Thanks!