Youtube Upload Fail Through WIFI router.

I’m currently uploading a video to YouTube from my phone.
The upload goes from my phone to the Wi-Fi router, then from the router to a proxy, and from the proxy to the YouTube servers.
However, the connection is quite unstable.
Most of the time it doesn’t work, and even when it does, it’s extremely slow.

Does anyone know what might be causing this?

[ Phone - WIFI Router - Proxy - Youtube Server ( Bad ) ]
The strange thing is that the speed is actually pretty decent.
Phone - WIFI Router - Proxy - http://fast.com/ Speed Test( DN 240Mbps UP 41Mbps 286ms 224ms )

Also, Upload without WIFI Router is Also Good.
[ Phone - Proxy - Youtube Server ( Good ) ]

I'm using connect by SOCKS5 for proxy. Is there anyone who can help me?

Why you setting a proxy?

From this you mean mobile data connection is faster but thru wifi the uploads are slow?

If so you need to reset the wifi and config them

Your upload issue is almost definitely coming from your Wi-Fi router, not the proxy itself. If uploads work fine using mobile data + proxy, but break the moment you pass through Wi-Fi, that means the router is interfering somewhere in the chain ,probably DNS or NAT settings. Try resetting your router config, remove any DNS filtering, and test without firewall rules. SOCKS5 is solid, but only if the local network isn’t messing with packet handling.

Thank you for your reply. Unfortunately, even after turning off the firewall on my router and not setting up any DNS from the beginning, the issue still occurs. I’m having a hard time figuring out the cause, so it’s quite challenging.