My wife is undertaking to become a volunteer at the San Diego Zoo, and they have given her some material to use on her iPad consisting of PDF files on a flash drive. She got an adaptor which allowed her to transfer the files (supposedly) from her Win 10 laptop to the iPad, but then the chaos began.

She cannot find anything that allows her to locate and read the files on her iPad. She cannot assure that they are even there, let alone read them. She downloaded an app and has found something that refers to using iTunes, but she has had no luck with the app and can do nothing with iTunes other than access the store.

I know a little bit about Windows systems, but absolutely zero about iPad. Can anyone contribute any guidance that I can send her way as to how to access and utilize PDF files on her iPad?