Ah right, thought i might of been automatically flagged as a bot for constantly opening a shitload of threads at once.
Seems to be alright now on my end though. Hope the attacks stops.
you can export mesh as the fbx file
Window > Package Manager > Search for FBX Exporter, install it > Place .asset mesh to Hierarchy > click RMB > Export to FBX... (set export format to Binary) > Export
edit exported fbx file in blender as you wish
THE ONLY PROBLEM FBX Exporter CONVERT FILE WITHOUT SKELETON so it's useless in most cases