How can we 확인 that Bambi was actually Walt Disney’s 가장 좋아하는 디즈니 film as said 의해 some people?(read description)

Well that's what I hear, but where exactly is the proof though? I haven't found any biography based stuff like if Walt ever personally mentioned it was his 'favorite'. The only thing I've found is in a Making of Bambi video where two of creators said that they 'believe' that it was was his favorite, but that's not knowing for sure. Otherwise, they would've said that it's his 가장 좋아하는 rather than adding "believe" with it.
I do know that Diane(his only biological daughter) is said that her 가장 좋아하는 movie was Fantasia as I heard she even attended a I think it was 70th anniversary of Fantasia.
Any proof 당신 have on her father's 가장 좋아하는 film though?