This htaccess snippet (lines 4-12) will pull any missing images from another URL. Helpful when developing locally or on a staging site where media is present on production but is too much to migrate to staging or locally.

.htaccess

<IfModule mod_rewrite.c>
RewriteEngine On

# BEGIN Use uploads directory from Live Site
RewriteBase /wp-content/uploads/
RewriteCond %{HTTP_HOST} !^www\.livedomain\.com
RewriteCond %{HTTP_HOST} !^livedomain\.com
RewriteCond %{REQUEST_URI} ^/wp-content/uploads/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*) https://livedomain.com/$1 [L,NC]
# END Media from Live Site

</IfModule>