that does not sound quite correct.
setis for cmd
set https_proxy=socks5://us-sjc-wg-socks5-105.relays.mullvad.net:1080$envis for powershell
$env:https_proxy=socks5://us-sjc-wg-socks5-105.relays.mullvad.net:1080
not sure what that means. variables are per session/terminal
and a while back, i did a testing with rclone and proxy.
https://forum.rclone.org/t/unable-to-use-proxy-in-windows-with-onedrive-remote/36092/5?u=asdffdsa
as an aside, this past week, i did a lot of testing running multiple proxy servers at the same time, using openvpn, wireguard, mullvad vpn+browser, firefox and so on.
always, each program would use a different proxy server, never once a problem.
and might follow this advice
https://rclone.org/faq/#can-i-use-rclone-with-an-http-proxy
"""
Slightly annoyingly, there is no standard for the name; some applications may use http_proxy but another one HTTP_PROXY. The Go libraries used by rclone will try both variations, but you may wish to set all possibilities.
"""