.mp4 480p seem to work fine.

.mp4 more than 480p

Even if some files go through, most of them only download _audio and _video in a _tmp folder but fail to make _media.

So it's a waste of time. Please tell me what I should do to make the _media. Thanks.

720p or more only works 3 times every few hours.

Are you limiting the download ?

Can we try team viewer session?