October CMS Magic Forms how to catch multi select values
It's possible you just need to make minor adjustments with the select name.
As when you select multiple items it becomes an array. to represent the array on the HTML side you need to add  square braces to the name.
Suppose your current select name is tech So your select name becomes tech as now we are representing multiple values so it becomes an array.
It will work and in backend records, it will show something like this :