Really??? When I click on a mesh in the content browser I have modified, I hit reimport but it never works. I have to delete it and import it back in as a new asset ( change all the settings). It works for textures for me though.
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I’ve had that before, there was a workaround but I don’t know if it still works though as I haven’t done it in a while, anyway what used to work was import as a new model and choose the replace/overwrite option when the message for having a file with the same name comes up, it used to update the mesh while keeping the settings but as I said I don’t know if it still works.