Turning transparent bitmap image into vector. White solid lines keep disappearing.

[Gina5E58]

Hello! First time posting because I haven't been able to figure this out through searching. 

So I have an image (with some white ink lines) that I drew in procreate that needs to be vectorized. I figured that out along with making it transparent, but when I hit image trace (on High Fidelity) the white lines disappear. 

Is there a way to keep those lines? I was considering going back to procreate and doing a black outline just so it doesn't disappear, but if there's an easier way I'd love to hear it.

[Kurt Gold]

Not quite sure about the trace settings you are actually using, but there is an option to ignore "white".

Is that option perhaps enabled while you are using auto-trace?

[Ton Frederiks]

White and transparent will be seen as the same by Image Trace.

You can try to create a background with a color that does not exist in your image.

Select the image and the background an choose Object > Rasterize, use the same resolution as your image.

Use Image Trace an delete the color of your background.