Mobile android 12 unable to play mp4 files

There are .mp4 files in the assets directory on my Android 12 phone. I have VLC set as the default app for playing video files. When I open these video files with VLC, they also display correctly. However, within Logseq, I am unable to play these mp4 files. Can anyone help me to get this done?
Out of curiosity, I installed the Obsedian app. Without having changed anything about the content, then the video playback did work. I don’t want to delve further into Obsedian, but if they can do it, surely Logseq should be able to do it too!