Showing action always but showing error if invalid

[_Excelrati]

Hi All

I would like to show a button of “Approve Inspection” to the user all the time.
In order to approve such inspection some details should be populated first.
Let’s assume these details are Inspection Date and Signature for example.

If the user presses the button while these are not provided, an error should appear and indicate that one or more of these details are missing.

Is there a simple way to implement this?

I tried using the Action option while setting a condition for “Only if this condition is true”.
But this means that the button will show only when everything is done perfectly by the user.
If not, he won’t see the button at all and then the user might wonder on the reason he can’t see that button, without the app giving him any clue on the reason.