Funny you should ask the question - I also have an R5 and wanting iPhone app support. It's months since I last checked after paying the rather high price for both Helicon Focus and the Helicon Remote iPhone app package... and still no progress.

I'm rather frustrated that R5 support is taking so ...

Hi - I have discovered the same issue. I'm using HF 7.6.1 Registered Pro Unlimited with Lightroom Classic CC (10.3) on macOS Big Sur 11.4. I haven't been using HF long, but this is the first time I've encountered the issue. In this case, I created a bunch of different stacks using the A / B / C ...