I created a File Advanced field in a group.
This Group is Sortable and Cloneable.
This Field is Sortable, Cloneable and Max number of files = 1.
Two files have been added in this field and save post.
However, only one file was displayed in this field.
The internal data has been saved, but the builder display is incorrect.
Fixes are not rushed, as they can be avoided in other ways.