Yes, but saving the keystore and password in the project is not the safer way. Even the android studio does not save it. We need to consider security reasons along with the ease of access.

First of all, make sure you have made a genuine purchase of our software.

Our support can surely assist you.
https://websitetoapk.com/support/submit_ticket

For any specific support issues, always raise a support ticket.

Actually keystore is not saved project wise in the project file. You need to manually configure it. You can use same key for all of your apps as long as you own all of the apps.

@mrphoenix You need to configure your own keystore to get it working. Now, virustotal remains an issue, so you see when there is like 1/63 or 2/63 detection, it itself says app is safe and there's a false positive that needs to be reported to be whitelisted.

No, you cannot add more files permanently offline, but you can use Ajax to sync new links on webpage and load directly from web, it would be better than offline.

It can be some of the embedded resources also. You can debug and view console to get to know the exact error:
https://websitetoapk.com/docs/debugging-with-chrome.html

For your specific query, connect support:
https://websitetoapk.com/support/

You need to debug your app to check console error and get to know the exact issue:
https://websitetoapk.com/docs/debugging-with-chrome.html

Just remove the CAMERA permission while creating the app using "Customize App Permissions" button.

Web notifications won't work. You need to integrate native android notifications using Firebase.