Hi,
I think there is a bug in the save/data object of the spreadsheet when you copy and paste.
webix.ui({view:"spreadsheet", save: {data:"server/data.php"} });
when you copy and paste data to a cell, two requests are sent: one with the old cell value (unexpected request), the other with the new one.
If a copy/paste is done on several cells, there will be two requests for each cell.
It is useless, expensive, and it is not the same behavior as a simple entry in a cell (only one request in this case).
Can you send one request please? As with manual entry.