There are also cross-platform apps for wireless file sharing between iOS/Android/PC/Mac devices, like AirDroid, SHAREit, Zapya, Xender etc. and some of them don't even need existing wifi network (wireless access point) because they create their own direct wifi connection as Airdrop does.
https://techwiser.com/best-airdrop-alternatives/
We can also use wireless flash drives such as SanDisk
https://www.amazon.com/SanDisk-Conne.../dp/B00ZCFYT5K
or non-wireless flash drives or flash drive SD card readers that can work with iOS devices, but in each case we should first download the file from iPad to usb flash drive and then upload it to Android (Max 2).
https://www.amazon.com/YiKaiEn-Reade...W3ZN6TWAGAZ5TS
https://www.amazon.com/dp/B075QSBTTH...0-8f50b5c91b8a