Scroll through posts with standard J/K keyboard shortcuts. L to like, O to save, M to play/stop. Why J/K navigation? Because it's also used in Facebook, Twitter, Tumblr, Gmail, etc.
< Feedback on Instagram Keyboard Shortcuts for Power User
This is still an issue and the J/K shortcuts don't work anymore now. :-(
It's now fixed.
Thank you, shortcuts work now!
When typing in the comment text field at the bottom of the post, the keyboard shortcuts are still working. Would be great to disable the shortcuts contextually in textfields.