Re: How to trigger only on particular Multiple choice value?
Hi @Kran,
Apologies, I was using a single choice field and not a multiple choices field.
I see in the response of a Get Row by ID action that a multiple choice field value is actually a string value with some separators. We were looking for a number in the filter, which wasn't correct.

While a single choice value is a number.

So, in case of one selected value for a multiple choice field an eq could work if we use quotes around the value
In your example that would be:
completedstages eq '284430015'
With multiple values selected in your opportunities record you could try and use a substring of function in the filter query.
substringof('284430015',completedstages)
However, in my dev environment I did notice my multiple choice field values weren't included in the trigger action response. So, hopefully that is only a bug in my tenant and not a limitation 😅