Zoom mobile app version is okay, then please check this.
Changing your chat settings
Tap the Settings (gear) icon
Tap the settings or the toggle to edit them.
Include Link Preview: Insert a link preview with the page title, preview image, and description whenever your message contains a link.
Receive Notifications For
Only private messages and mentions: Show notifications for private 1-on-1 chats and any time someone uses @(your name) in any channel (group chat).
With exceptions for groups: Set exceptions if you want specific channels to have different notification settings than the one your set above. Note: If you don't see these options, tapTurn on Notifications to open the iOS notification settings for Zoom.
Keep all unread messages on top: Move chats with unread messages to the top of your chats list.
Show unread message count for channels: Display the number of unread messages beside each chat.
Move messages with new replies to the bottom of the chat
Receive notifications for keywords: Set keywords you want to receive notifications for.
Notify me about new replies on messages I am following
Disable when in meeting: Disable notifications when you're in a meeting
Do not disturb: Temporarily turn notifications off for this device or set the time period when you do not want to receive notifications.
When viewing unread messages in a channel
Start at the first unread
Start at the latest
Show message preview
When to Notify Me
Always, even if I am active on desktop: Always receive notifications on your phone even if you are active on the desktop client.
Only when I am not active on desktop: Only receive notification on your phone if you are inactive on the desktop client.
In-App Vibrate: Vibrate when a notification is displayed.
In-App Alert Sound: Play a sound when a notification is displayed.