Drop in a 3MF downloaded from MakerWorld. You'll get a file that opens in ElegooSlicer or OrcaSlicer set up for your printer, with the designer's print settings kept. Everything happens in your browser; your file isn't uploaded anywhere.
Slicer
Printer
CANVAS multicolour unit
OrcaSlicer's Centauri Carbon profiles don't support CANVAS: colour changes pause for a manual filament swap, so multi-colour files are converted as a single colour.