I notice you're asking for a "proper paper" on downloading the SutonnyMJ Bangla font for Android. However, that topic is better suited for a technical guide or blog post, not an academic paper.
To download and use SutonnyMJ, a popular non-Unicode (ANSI) Bengali font, on an Android device, you generally need to acquire the .ttf file and use a third-party font manager or specific application that supports custom font uploads. Download and Installation Steps
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The Ultimate Guide to SutonnyMJ Bangla Font Download for Android
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Some Samsung devices allow "Unknown source" font installations directly. Go to Settings > Applications and enable Unknown Sources.
SutonnyMJ remains the most popular and essential font for anyone typing in Bangla, especially for those using the Bijoy keyboard layout. While it was originally a staple of desktop publishing, the demand for SutonnyMJ Bangla font download for Android has surged as mobile users look to create professional documents, social media graphics, and edited videos on the go. Why SutonnyMJ is the "Hot" Choice for Android I notice you're asking for a "proper paper"
If you have a rooted Android phone (Magisk), you can flash a custom font module. This is the only way to make your Settings menu and Notifications appear in SutonnyMJ.