Uploading a 2D image will result in a flat 'model'. This can be used to represent images like a poster or a painting, we highly recommend you use DAE or OBJ files, but other (less complete) export formats can be found here.
Recommended 2D image formats:
The files containing 2D images do not need to be zipped before manual upload.
JPG (or JPEG)
BMP
PNG
TGA
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If you're looking to upload a 3D model instead, click here.