Tl;dr: How do I replace meshes stored in a Unity 5 ASSETS file?
I'm new to Unity and I had made a prior post that didn't make much sense because I had no idea what I was talking about or trying to ask.
I'm attempting to replace meshes in a game written in Unity 5 (yes, old game). I'm able to export the mesh (*.obj) out of the assets file, create new meshes via Blender and Unity 5.2, but I have no idea of how to import the new meshes. I've tried AssetStudio and Unity Assets Bundle Extractor (both legacy and the Avalonia version). Neither has an import option. Allegedly UABEA has a plug in, but I can't find it. I'm stuck and I don't know what I should try next. I'm open to any suggestions.