Ok, DPI has no bearing on digital artwork. The only size is pix size of the canvas. DPI is a print term. Here is a simple explanation. Your canvas is 2000 px across. If you export for print at 300 dpi, the picture will be 6 inches across. If you export it to 1200 dpi the picture will be just over 2 inches across. The pix don't change, the quality doesn't change. There will always only be 2000 px across. That is why if you take a digital picture and make it too big, it "tiles". Each pix gets too bigger, the quality stays 2000px across.
If you want to ever print your artwork, work at least X5 larger across than the max of needed. You can always scale down (destroying information), you can't scale up (creating information). For my webcomics I work X5 larger than the max upload and export to the resize needed (20% of original). Always keep the original full size. NEVER resize on a website, do it yourself in program and then upload. Even a free art program is better than a website compression.
Clip has an export to webtoon option that takes care of all that.
