Mixamo won't display png textures on an obj model

Hi, I'm trying to rig a textured model from p3dm.ru. It opens correctly in Blender and 3d Viewer. I followed the advice here:

https://community.adobe.com/t5/mixamo-discussions/uploading-3d-model-into-mixamo-with-textures/m-p/11679158#M342

The model was already an obj file, I made all the texures into png, then modified the mtl file accordingly (although it still contains folder paths from my PC, maybe that's the issue?), then I've packed everyting into a zip:

https://drive.google.com/drive/folders/1-ZtA8n3W171avx91Hp1_7UzHGttUaW2y?usp=sharing

But uploading the zip into mixamo.com still gives me a textureless model. What am I doing wrong?