Huawei Health app is an app that monitors users' daily exercise. It is not a music player, and there is no app that can download other third parties.
When using Huawei Health app, Apple mobile phone can't find music, because Apple mobile phone doesn't support the music function of Huawei Health App, so Apple mobile phone can't find music. If you want to listen to music on Apple's mobile phone, you can do it by installing other music playing software.
Open the Huawei Health App device, jump to the watch function setting interface, and enter the music setting. Music management to add music, select the music to be added from the list, and click √ in the upper right corner to complete the addition.