I'm having trouble applying filters to syndicated content (using FeedWordPress).
The following test plugin works for content I manually post, but not for syndicated content:
Plugin Name: A Test plugin
Description: A test plugin
What is different about syndicated posts that this doesn't work for them? I tried messing around with the wp_posts table post_author, excerpt, and guid fields to see if making those like my own posts would fix it, but that didn't seem to work.