Is there any problem if I upload a gameplay video without the game sound? I mean, if the video is just the gameplay with random music in the background

You’ll have to verify with the mods of the game if this is okay, but my personal standpoint is that I would reject any run without game sound.

Audio is big part of verification, and to have random music just makes a run seem more questionable to me because I can’t verify anything about the run in terms of audio matching or whatnot.

In general having the original game audio is best for verification purposes, but unless it's a top tier run or you're playing a fairly competitive game it's probably fine.

I don't think I can beat world record haha (Megaman x4 as Zero) but I do it fast anyway. Thanks for ur answers!