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How to fix in magento 2 404 images? When magento root in PUB folder?
You might be missing .htaccess in your /pub/media/ folder.
Since you made changes to Apache, you might have disabled the Options FollowSymLinks setting (since you mentioned that you increased security).
So you might have to change
Options +FollowSymLinks
to
Options +SymLinksIfOwnerMatch
in .htaccess in the following locations:
{Your root Magento directory}
/pub/
/pub/media/
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