Cannonless on the switch works pretty much as it does on any other platform as far as I know. There are plenty tutorials out there.
the only difference with the 3d all star version is that Sm64 3d all star is the shindou version, meaning BLJ is patched so you cant do anything that isn't 70 stars or higner. Sadly :/
You can still utilize all the guides in Ukikipedia. If you're on switch for cless specifically, you can utilize the d-pad to get the straight down angles when required.
If you wish to replace your twitch highlights with reuploads, please edit your already verified run rather than deleting the verified run and making a new submission. This makes it a lot easier for us to track which submissions are reuploads and should be less work on your part as well.
If you need