This ENTIRE!!! TWRP folder has to go on the root of your external SD card or internal doesn't really matter at this point.
Or if you have a TRWP on your SD card just copy the "dated" folder in there and TWRP should be seeing it then.
Your tree structure should look like this.. TWRP... BACKUPS... "bunch" of numbers folder... then the dated folder.
Once you have done that go into custom recovery "TWRP" and go to back up and restore and navigate to the file and swipe to restore.
Hoping this helps
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