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install download apk

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I use huawei mate 20 pro. After I download some apks, I click it in the download page, it didn't work. Even when I press the apk for a while then click the open command, it didn't work either. I am certain the firefox has the permission to install apks on the phone, checked. what can I do to make the download apks usable?

I use huawei mate 20 pro. After I download some apks, I click it in the download page, it didn't work. Even when I press the apk for a while then click the open command, it didn't work either. I am certain the firefox has the permission to install apks on the phone, checked. what can I do to make the download apks usable?

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Firefox does not install APKs. If you downloaded an APK, then it's a file on your file system, and when you try to run it, the system will install it, provided that unknown sources are enabled in the system settings.