Some explanation about how work QElectroTech for this aspect.
Suppose you drop an element X in a folio and connect it with conductors to anothers elements.
After that you modifies the element X from the element collection and drop it in a folio (no matter if it's the same folio as before or not) a dialog will opening and ask this questions:
Using the already integrated element -> the modified element is not used but the already added element.
Integrate the dropped element :
Overwrite the already integrated element.
Make the two element coexist.
In case of coexist, the modified element is added as a new element and not as a modified one.
And the interesting case for the end :
When you choose overwrite, the modified element is added and have visually the new aspect and the already added (we call them old for the suite) element keep the same aspect BUT inside QElectroTech the 'old' element are marked as overwrite and all the change are applied when you re-open the project, so when you save, close and open the project the 'old' element is now visually (and also the parameters) the modified element.
One precision if you want to not lose the connected conductors when you open the project with modified element, all terminals of element (the red stick with blue dot) must not be modified or moved, else you lose the conductors.
I hope this explanations is clear
PS : at the moment I write this post I also test with qet to not write mistake and I encounter a bug, if I choose overwrite and the terminals of the element was moved the old elements have simply disappeared .
It's a bug, the normal behavior should be the modified element but without the conductors.
Be careful in waiting I solve this bug.