SVGs with a width/height that are too large are not displayed in the preview
Using a svg with width= and height= set too big will not display in the right preview, but will in the lower left. This is similar to #14 (closed) maybe? For example, the wikimedia commons greek alpha: https://upload.wikimedia.org/wikipedia/commons/a/a1/Greek_lc_alpha.svg This has 200x200 size by default. I have to manually resize it with an editor so it displays in Emblem.
Edited by Jan Martchouk