How do i save the option clicked in a dropdown input element to my database

i want to use a save button to save all inputs typed into all the input fields on a particular page on my app but the all the dropdown inputs are greyed out and not clickable when i create the workflow action to create a new thing of a type i already created with many fields.

i’m to create this workflow :
“when Save Button is CLicked
create a new thing of type Readings
Location= dropdown locations value.”

but the dropdown option is greyed out

If I understand your question correctly, I think the clue is right there in your screen shot. It appears to say “incompatible type” beneath each of the disabled items. Double check the “type” of the dropdown as compared to the “type” of the DB field.