Y a t'il un autre moyen de positionner les blocs

I looked again at your other thread Besoin d'aide pour le script - #9 by TIMAI2

Which means, you upload each image separately and get back exactly 1 id

In this case you should differentiate...

if uploading image1,
then get back id1 and display image1
elseif uploading image2
then get back id2 and display image2
etc

Taifun