SanDisk Extreme SSD 1TB not detected by IPhone 11 pro max s/w ver 14.6

SanDisk Extreme SSD 1TB not detected by IPhone 11 pro max s/w ver 14.6 or iphone 7.
Work on Surface tablet Pro
reformatted with quick format to exfat
on the iphone i’m using a lightening adaptor to split lightening and USB. During this the iphone charges but the SSD is not detected

Hi @rochem12345,

Please follow the link to format the iXpand drive with help of PC: http://kb.sandisk.com/app/answers/detail/a_id/312

Please follow below link to check your drive is detected in Windows:-
https://kb.sandisk.com/app/answers/detail/a_id/10

Please follow below link to check your drive is detected in Mac:-
https://kb.sandisk.com/app/answers/detail/a_id/13015