@sajuuk If you're having an issue with it not displaying the entire photo in your feed, there's an account setting you can adjust. While this setting is respected by the desktop site, mobile site, and PWAs, it's not a given that all third-party apps will play nice. By default, it's set to crop all images to 16x9 to reduce how much space they take up in the timeline.
To adjust this from a browser, go to Preferences > Appearance > Post Layout > Uncheck "Crop images in non-expanded posts to 16x9."