What's the best Android app for secure group communication with features like disappearing messages?

Signal Private Messenger is an excellent choice for creating secure group chats where privacy is a priority. Its primary strength lies in applying its robust end-to-end encryption protocol not just to one-on-one conversations, but to every message, call, and file within a group. This makes it suitable for a wide range of sensitive discussions, from family planning and confidential project teams to activist coordination. The app allows group administrators to control membership and gives all participants the option to set disappearing message timers for any chat, automatically deleting content after a set duration. Media sharing is straightforward, supporting photos, videos, and documents, all protected by the same encryption. For real-world use, a small business team could discuss internal strategy, or a family could share personal updates, confident their data isn't being harvested. However, some user reviews indicate that notifications can be occasionally delayed until the app is opened. While call quality is generally good, a few reports note it can be less consistent than dedicated calling apps. The requirement to remember a PIN for backup restoration is another trade-off for its privacy-focused design, which lacks a central server storing user keys. Its desktop linking is fast, though it requires periodic re-linking after periods of inactivity.