I have fonts that are 2-tone.
Specifically, White Glyphs with a Black Cast Shadow, or with a Black Outline.
Is there any way to upload them? I see Glyph Color alters what is chosen, but none of the settings seem to work.

I do not know too much about fonts, so I do not know if fonts can only be greyscale or multi-color, but I know there is some way to.

The sort of color font that the underlying library produces is only supported in Firefox and certain image editors.

It is what it is.