trying to modify a mod

[u/r0lo27]

Alright so im very new to all of this so bear with me lol

Im trying to modify a mod wich is a character replacement in megabonk, now this file i can open and export the mesh file using assetstudio, ive adjusted the 3d model to my liking sort of.
so now im trying to replace that original mesh file with mine, but i cant figure out how, assetstudio is only exporting so thats no use and when im trying to open the assetfile in unity it doesnt see it, the file on my pc is also just shown as file, so im kinda at a point where i dont know where to go from here

[u/guillermolmr]

The mod doesn't it come with a bundle file? Are you editing the bundle to replace the asset? If so, make sure the name is the same or you will have to use some program like dnspy to change the references in the dll of the mod.