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Imported step file trouble extruding
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Hello. I am relatively new to 3D modeling but have been using OnShape to make designs for 3D printing for about a year. I understand most of the basics of sketches and extrusions and have played around with revolves, lofts, sweeps etc. One thing I would like to get better at is remixing designs. To that point I have uploaded a STEP file for a mahjong set thinking I might modify it for a gift (adding English numbers, maybe some other little touches). When I look at the imports it shows the part for each tile, but the images on the tiles show up as curves and are just drawn on top. I seem to be unable to extrude these and I am not sure how to proceed without just redrawing each curve in a sketch and that seems overly laborious. I have tried to search for tutorials and solutions for working with curves but because of the generic language it is difficult to find what I need. Here is the document I'm working with:
https://cad.onshape.com/documents/4bcf302c62a721aa5c63373e/w/b0783808389d13626e54fc18/e/725f0e71b99030f689576eda?renderMode=0&uiState=67af7bde7a7c7b017d3bc36d
Any help is appreciated!