Can’t install modules from UI when site placed in subdirectory

I have Drupal 8 installed in a subfolder (www.example.com/drupal), and I have my root .htaccess configured to mask the subfolder (i.e. the URLs resolve to www.example.com; /drupal does not appear in the URLs).

Everything works great except when I try to install new modules I get a 403 error. I see in the URL for authorize.php that /drupal now appears in the URL. Where I would expect www.example.com/core/authorize.php/, I instead see www.example.com/drupal/core/authorize.php/. I imagine this is the reason for the 403?

What additional modifications do I have to make to /drupal/.htaccess in order to get access to the /core files required to install new modules?

Here’s what’s in my document root .htaccess:

RewriteEngine On RewriteCond %{REQUEST_URI} !drupal/ RewriteRule (.*) /drupal/$1 [L] 

And the only modification to /drupal/.htaccess is to uncomment the subdirectory per the instructions in the file:

# Modify the RewriteBase if you are using Drupal in a subdirectory or in a # VirtualDocumentRoot and the rewrite rules are not working properly. # For example if your site is at http://example.com/drupal uncomment and # modify the following line: RewriteBase /drupal 
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Can’t install modules from UI when site placed in subdirectory

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