Sorry for a late response: you unzip it inside BM3 directory, probably ideally via Files app (BM3 has a directory inside “On my iPad”) and inside “Bank Presets” (does not have to be, but for keeping things in order it makes most sense). Then iniside BM3 browser, you should see it inside “banks” or you navigate via “documents” (directory icon next to search icon) into Bank Presets directory and load it as any other bank preset.