Why wont my galaxy s7 install apk

I click download on apk app. It says it's downloading. I go downloads in my file manager and it shows it there. When I click on it lights up briefly button does nothing. It won't go to download screen or open. It's like it's there in text only. I click on other downloads around it and they open fine. I've tried rebooting, shutting down app/widget overlays, tried a different browser, used an apk installer, enabledo download from unknown sources, and a few others but nothing works. I'm puzzled

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