AppSealing disables apk`s signature when applied. The zipalign and signing are required before release or installation.
1. Apply zipalign
zipalign -v 4 [APK_FILE] [ZIPALIGNED_OUTPUT_APK_FILE]
Zipalign must be applied before signing apk.
2. Sign your apk with ApkSigner
apksigner sign --ks [KEY_STORE_FILE] --ks-key-alias [ALIAS] [APK_FILE]
Zipalign & apksigner tools are installed at
In general, no matter which version of the SDK you use, no problem with signing and zipalign.
Check google`s guide for detailed information about zipalign and apksigner tools.