How to create multiple select drop-down check-box in Google Sheets/Apps Script?

Question

I am trying to make a drop-down list in Google sheets, but the problem is I want multiple select feature in that dropdown. The checkbox feature available in Google sheet is only single select. I've searched a lot but all the available solutions consist creating a extra menu, but I want it to be multiple select checkbox in a dropdown.

Answer 1

This is not currently possible. You would have to write an add-on/sidebar that would let users select item(s) and then save values to the cell.