To ensure your custom sounds work properly, they must meet specific Telegram specifications : Files must be in MP3 format. Duration: Sounds should be under 5 seconds long. File Size: The file must be 300 KB or less . 2. How to Change Notification Sounds
Tap on and select a preset or tap Upload Sound to add your own MP3 file. For a Specific Contact or Group:
Go to your phone's > Notifications > Advanced Settings . Enable Manage notification categories for each app .
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