Yes, you are right. And for reference this is the article itself: https://ziggeo.com/blog/video-recorder-expands-capabilities-re-selection-of-cover-images/
This is available on all platforms now (Android and iOS included). The only requirement is to use r34 (or later ones in future).
I presume that you have tried with some other revision however please do let us know how it goes with the r34. :)