The video(MKV)inserted can't cut

After inserting the MKV vedio, the timeline show it’s just 1s, can’t solve this problem,
It used to be okay

Hi,

Regarding your issue, please try converting your video before importing it into ActivePresenter.
You can refer to https://handbrake.fr/ to see if it works.

Hope this helps.

Kind regards,
Quynh Anh

Thank you, I wil try it.