I’ve found a solution for insert and redefine a DWG file as a block in Autocad 2020: In the Other Drawing tab browse to the file and select it. You’ll be prompted the Block - Redefine Block pop-up. Insert the redefined block. There are some issues though: Right Click “Insert and Redefine” and “Redefine only” are greyed out. Seems like a bug to me.
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