@XPran As an addition to TELEports and Whatsweb, did you try as well to install Waydroid in Ubuntu touch? Native Whatsweb and TelePorts app for Ubuntu touch should do the trick for most day-to-day needs, and offer notifications. But having a fallback to official Whatsapp and Telegram in Waydroid may be usefull as a complementary solution, if you need some advanced features at some point. In addition to those already mentioned, uWolf can be another solution for modern pdf reading, although if it's a local file you currently need to enter this url manually "file:///home/phablet" then browse to your file on disk. You can bookmark the url or even set it as homepage if you don't use uWolf for browsing. Hopefully in the future we will be able to directly open file with uWolf from file explorer app with content hub. Make sure to keep your system and applications up-to-date as things are rapidly moving forward.