How do I import Mixamo animations onto Roblox Rigs?

I’ve come across this link, but I am not quite sure how to import my rig. It has the same structure and joints as an r15 rig and is compatible with r15 animations, but it was built from scratch. I’ve also tried importing the .fbx file directly and didn’t work. How would I continue?
Edit: I’ve managed to get a .zip file with textures onto the autorigger, but the rig didn’t show at all.

Try to import .fbx into animationEditor
I don’t remember how to do this, but you can

read the post. I did.

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gonna bump this. I need info. I tried the blender rig/animation importer, but blender does not support 6100 fbx and I do not have a good converter which leaves the animations in.