So I downloaded Tahoe 26 M1 iMac and I can no longer drag and drop video clips into the editing field. I am able to load it into iMovie but I can't enter the video clips into the editing window. Any ideas please.

所以我下载了 Tahoe 26 M1 iMac，现在无法再把视频片段拖放到编辑区域了。我能把它们加载到 iMovie 里，但无法把它们放进编辑窗口。请问有人知道怎么回事吗？