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And I think fake leather is an area drop, and a fairly low one. It's probably in rank 3 maps if I had to guess, since I recall seeing it when doing my solo runs.
*it might be simpler just to exchange it through the craft item menu, where you can trade minerals for it
Green R2
Purple R3
Blue R4
Rose R5
Orange R6
Gold R7
As for the materials themselves, the same "group" always drops from the same map, so for example, the "Thread" group, (Thread, Cotton, Raw Silk Thread, etc) always drops on Lower Reaches. Leathers are always on Abandoned Mines - Until those maps are replaced by other maps in the rank rotation.
As others have stated, you can tap ALT twice(or controller equivalent) on the mission screen to double check.