'Send/sync files between Wear OS watch and Android phone without extra/companion app on phone

I studied google doc https://developer.android.com/training/wearables/data/data-layer how to sync/send files between watch and phone but there is not stricte said if I need mobile apk on phone too. Seems MessageClient or ChannelClient needs a client app on phone side to receive data/files with the same signing certificate. Is that correct?

I saw apps in play store for watches which allow to sync files with phone but doen't require apk on phone side. How is it possible? What solution they used to transfer files?

thanks



Solution 1:[1]

No, the companion apps on mobile provided by OEMs like Google and Samsung don't provide APIs for apps for Wear OS to access files.

The apps in the play store look like they all have mobile companion apps to provide that functionality.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Yuri Schimke