Installing on Android
Tap Download, then open the file. The first time, Android asks to allow installs from this browser (Settings → Apps → Special app access → Install unknown apps). An update installs over the old version only if both are signed with the same key; otherwise uninstall the old one first.
Only signed APKs appear here: unsigned files and builds signed with the Android debug key are hidden and cannot be downloaded. Published releases are also checked against their signed manifest.