In addition to iOS 13.4 and iPadOS 13.4, Apple also released updates for other smart devices, including macOS Catalina 10.15.4 and watchOS 6.2.
The addition of Catalina 10.15.4, like iOS and iPadOS, is to share the iCloud folder, as well as items that have been iPhone since last year, like Apple Music Time-synced lyrics.
This iCloud Drive sharing feature has been around since testing iOS 13 and macOS Catalina beta. But was removed in the full version until today
For watchOS 6.2, additional features are In-App Purchase directly from the watch and ECG is available in three additional countries. Users in Chile, New Zealand and Turkey can use it without having to forge a Region Watch to use.
In addition to the new features, there are also fixes for bugs where music will stumble. When changing from a WiFi connection with the router to Bluetooth on mobile instead, once updated, users will not encounter this problem again.
For those using the iPhone version that updates to iOS 13, it does not make use of watchOS 6. Apple also released the watchOS 5.3.6 update as well, but there are no Changelog what features have been fixed.