For some reason I cant import blender models into Roblox, the same message comes up times after times. The computer tells me that my chosen title is inappropriate. I hope this question is allowed on "Scriptinghelpers", if not I do really apologise.
I just asked our builder and she said she inserts a meshpart object into Workspace. Then click on that meshpart and select the folder next to "meshId". Choose wherever you saved your blender model.