To have your own wavetables, pluck excitations and impulse responses appear in the respective oscillator library along side of Falcon’s factory content you need to move these assets here: $ (documents)/UVI/Falcon/User Data/Wavetable/ $ (documents)/UVI/Falcon/User Data/Pluck/ $ (documents)/UVI/Falcon/User Data/IR/
All articles related to organizing Falcon assets and 3rd party libraries.
Falcon does not import foreign sampler formats besides SFZ. Just drag & drop an sfz-file into the program slot. Not all data embedded in an sfz (like e.g. round robin chains) always translate though.