On Android builds, UI input only seems to work if you have one finger on the screen and then tap on the UI element (2 fingers on the screen total). This reproduces in a new project, blank scene with just the default Canvas, EventSystem and Button added. We’ve tried b7 and b8 and the issue happens in both. However, iOS seems to be unaffected and UI input works as normal.
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Bumping as this is still occurring in 5.4.0.b9.
Known bug: Unity Issue Tracker - Input needs two touches to work on some Android on second run
Will add to future known issues until cleared.
Thanks. We’ll keep an eye out for the fix.