I'm trying to attach the debugger to my android device to be able to stop on a break point inside Rider.
What I do is simply starting the app on my device, then in Rider Run >> Attach to Unity process... and select the device.
The debugger is successfully attaching to the process.
At this point the running app seems to stop and after few seconds crashes; the debugger detach from the device.
The test was done on Unity 17.3 with "Scripting runtime version: Stable (.Net 3.5)"
Then I tried with "Experimental (.Net 4.6)".
This time the app didn't crash but didn't stop to the breakpoint either.