When used with the present perfect, the adverb "ever" refers to any point in time from the past until the present. In this case, the specific period of the event doesn't even matter, so it's usually not mentioned. This is the most common usage. For example:

Have you ever got nervous at work?

Have you ever heard of eucalyptus?

When used with the simple past, the adverb "ever" refers to a specific period in the past. In this case, the period of time is usually mentioned. This usage is less common. For example:

Did you ever get nervous when you were working in Spain?

When you were in high school, did you ever hear about a plant called eucalyptus?

I hope that helps,

Tiago