Unfortunately this is a bug in the Substack app, and not specific to my publication. You should submit them a bug report. I did notice that if you leave the app open for a while on the page, and maybe scroll up and down, the videos eventually load. But they do look blank for the first 10 seconds.
Question for you: do the video links not work when reading the post inside the substack app? Thought I’d let you know
Unfortunately this is a bug in the Substack app, and not specific to my publication. You should submit them a bug report. I did notice that if you leave the app open for a while on the page, and maybe scroll up and down, the videos eventually load. But they do look blank for the first 10 seconds.