After hours of research, I finally found the remedy to my problem. Here it is if some of you guys have the same issue as I had. "Missing file" message on audio, file is available and works in desktop version - #4 by dae I just logged out from my DesktopAnki and logged back in with syncing, then synced on mobile version ( Shout out to @dae )
However, in my AnkiWeb I still can’t play my media, even though I rarely use AnkiWeb. I fixed it on all of my devices and synced everything, but when I checked the media there was a lot of ‘unused’ media, is it normal, or should I be concerned? And what happens if I delete Unused files?