"Trimming cannot be used while the sound setting for this video is on. Please turn off the sound and try again." error occurs and can't operate with the Android app.

2021-04-06 06:33:42 UTC 2023-12-07 05:58:23 UTC

You cannot trim videos with audio " ON " with Android 9.
Please operate with a device other than Android 9 or set the audio to " OFF " before trimming.

Related article: Mute video (Android version)
https://teachme.jp/8/manuals/14546163