Analyze popup when uploading data about loosing data

[marianfoo]

With #223 it was #214 fixed
Need to analyze why this popup for loosing data activated.
On V2 FE Non Draft 108:
In Object Page, go to edit mode and change a line. Then upload a Excel file.
A popup appears about loosing data.
Apparently also happens on list report when uploading Excel files twice.
Currently the popup is just turned off, but there is maybe and underlying issue or better solution for this.
Maybe this is just the best solution.