Can't join objects with different materials

by Evgeniy Mh   Last Updated April 16, 2018 04:15 AM

I'm trying to join multiple objects with different materials(Ctrl+J). When I join them they disappear in render view. I was trying to assign materials to different mashes, but it doesn't work! I just don't know what to do

This is my blender file:

There is flower model and 4 materials: green for flower stem, flower leafs and flowers

I joined flower stem,leafs and flowers but it shows only flower stem in render view.

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