As far as I know, iPhones are are affected in general not auto-playing any video if Autoplay is on (and Controls are off). Firefox on Android autoplay my videos. Firefox on iOS (iPhone) does not, neither does Safari.
As soon as you switch on the controls in Blocs, the video still does not autoplay on the website, but with the controls it can be started (on iPhones). To Note Android phones are not affected by this - they autoplay fine.
But worse, a new problem just occurred that I did not have had before. On a client’s website I have on the home page a background video and on the shopping page the normal video bric. On both videos I switched in Blocs the autoplay and controls on and uploaded it 10 minutes ago to the web server. When I start either video on the iPhone, it plays the video in a modal with black background. However, this could be, because my video dimensions are not the predefined 16:9 standard in Blocs. But it is annoying, because the video dimensions had been specifically made shorter in height to remain in context of the other elements on the page.
Yes, you are right I wished that Blocs would have the function at least to put a “Play” button triangle in the centre of the video (like it is on the sample Vimeo video bric in Blocs) to start the play as an alternative control.
However, I think the whole kerfuffle has more to do with how Apple does not want video and sound to be played automatically.
Yes, your video runs on my iPhone (16:9 Blocs standard) but the video is left and right truncated. Same effect as if you use a picture for the Hero Bloc and watch it on the XS breakpoint. Only the vertical middle ground of the image is visible. Same on an Android phone.
It looks like an image with Ken Burns effect. If this is done as a video it does work fine in my iPhone. Now, how did you do this?