Can't get photos to transfer from Canon 5D Mark IV to iPad

[Wil130553]

Hello,

Can't get photos to transfer from Canon 5D Mark IV to iPad via cable but only when I remove one of the cards. Doing this with the 5D mark iii is no problem. What am I doing wrong? 

Nb. All latest firmware installed.

[Wil130553]

Updated 5D mark IV

[SpiderWoW]

same firmware than before ?

there is no new firmware since a year

[Wil130553]

I had not updated it for 1 year but never the less my problem is solved