Tried to upload level set to the workshop

[Gavin]

I used the levelset -> share option but it says "preview image is missing, add one using the level set editor".

If I go to levelset -> edit it says "this level set uses advanced fun features, please open with a text editor".

Does this mean I need to edit the .c2g file to add a preview image? How?

[ncrecc]

Drop an image named preview.png in the file folder.