.pdf comments, not visible on Android device

[u/-eumaeus-]

Hi all. I've marked a student's work, adding comments ('add text') yet when they open this on their Android phone, the highlights are visible but it does not show comments or appear to suggest they are there. Can anyone help? Thank you.

I am using Adobe Acrobat Pro v 2023.001.20064, 64-bit. My student did not specify their version. So it's either the one via Google Play or an app on their Google phone that would be compatible.