This is currently not possible because of limitation imposed in Android 10 and above. Refer this https://developer.android.com/privacy-and-security/risks/secure-clipboard-handling 

There is some history behind it, where some apps were found to be copying clipboard content silently and sending it to remote servers. Since this was a security risk, Android had to tighten the security and as such no longer allows automatic access to the clipboard unless the app is in foreground or the app is registered as the default input method (eg. a keyboard app)

I think we can close this issue as the behaviour is correct and there is no easy workaround to this problem.

I also want this feature. Previously (before android 13), I could use the Magisk module [ClipboardWhitelist](https://github.com/Kr328/Riru-ClipboardWhitelist), which requires root permission. But after Android 14 and so on, I had to send the clipboard via the widget. 

However, recently I noticed that there is another way to do this.  I found a repo [kdeconnect-android-shizuku](https://github.com/Shoukaku39/kdeconnect-android-shizuku), which utilizes [shizuku](https://shizuku.rikka.app/) and does not require root permission

With these two commits `543b516d492371856b9d758d3ceb91666f7dc088` and `9e740e953b97387fadf32a6f14e00bfb4f6e4020` meged we can then automatically sync the clipboard between pc and Android.