the links you need to open are
https://www.wickeditor.com/editor/ (Or the test link)
and https://www.wickeditor.com/editor/project-converter/
what you do is go on the legacy upload an svg after that convert the project with the project converter to convert it to 1.19.3 and after that open it up and it will have the svg
(I recommend doing simple svg files and not gradient ones)