Which flash drive do I need for iPad 4th generation Retina display

Pickins’ are slim for a very near 9-year old iPad midel.

You need to use a USB Flash drive that has a built-in wireless WiFi hotspot built into the drive for wireless, WiFi connectivity ONLY.

These are few and far between today, in 2021.

These would work.

https://www.amazon.com/SanDisk-Connect-Wireless-Stick-Flash/dp/B00ZCFYT5K/ref=sr_1_1?crid=1ZAHVY8CPM8R2&dchild=1&keywords=sandisk+connect+wireless+stick&qid=1629403805&s=electronics&sprefix=Sandosk+connect+%2Caps%2C197&sr=1-1

OR

This one.

https://www.amazon.com/SanDisk-iXpand-iPhone-Silver-SDIX30C-128G-GN6NE/dp/B01MUH9BET/ref=sr_1_4?crid=1ZAHVY8CPM8R2&dchild=1&keywords=sandisk%2Bconnect%2Bwireless%2Bstick&qid=1629403805&s=electronics&sprefix=Sandosk%2Bconnect%2B%2Caps%2C197&sr=1-4&th=1

OR

https://www.amazon.com/SanDisk-iXpand-iPhone-Silver-SDIX30C-128G-GN6NE/dp/B01MUH9BET/ref=sr_1_4?crid=1ZAHVY8CPM8R2&dchild=1&keywords=sandisk%2Bconnect%2Bwireless%2Bstick&qid=1629403805&s=electronics&sprefix=Sandosk%2Bconnect%2B%2Caps%2C197&sr=1-4&th=1

Maybe this one, too!

https://www.amazon.com/SanDisk-256GB-iXpand-Flash-iPhone-dp-B07VQPDM56/dp/B07VQPDM56/ref=dp_ob_title_ce

Good Luck to You!