Hi gioh,
The best way to do this depends on what data is provided by your source feed. If you are seeing only short summaries imported by FeedWordPress, then it is likely that the feed only provides the short summaries and not full content. (Some choose to do this as a matter of policy.)
Unfortunately, if that’s the situation, FeedWordPress doesn’t have any good general way of extracting the full text of posts if the feed producer only provides a summary. Depending on your situation, it may be possible to write an Add-On module that uses the link URLs to scrape full content from the HTML (so for example I’ve written custom add-ons for clients who were using a Reuters content syndication API where the only way to get the text of stories was by making a back-end request and scraping the output). But how well this will or will not work depends a lot on the details of your situation, and the policies of the original content provider.
Have you taken a look at this link here: https://feedwordpress.radgeek.com/wiki/how-do-i-get-feedwordpress-to-include-the-full-content-of-posts-instead-of-just-a-short-summary-or-excerpt-of-the-text/ ? If not, take a look and let me know whether it accurately describes your situation. If you’re not sure, feel free to send me the URL of the feed you’re trying to syndicate, and I could take a look and let you know what I find.
