Installing

Open the Apks tab, tap the file and choose Install. The app uses the system session installer and automatically picks the splits that match your device.

Android requires an explicit permission before any app can install packages. Tap Settings in the prompt, turn on “Allow from this source”, then go back and try again.

Yes. Select multiple files in the Apks tab and add them to the install queue; they are then installed one after another. Batch install is a Pro feature.

The usual reasons are a signature that differs from the installed app, a version older than the installed one, missing splits for your CPU architecture, or not enough free storage. Uninstalling the old app first solves most cases.