A user can apply overlays on custom image. Here some easy steps are given so a user can apply overlay on custom image follow the steps to apply overlay

custom-image

Step 1 First click on Settings
Step 2 Now first select the overlay settings and save
Step 3 copy the Short-code as shown
Step 4 And Paste in post page for custom image
Step 5 Give a proper path and name of image and Update/Publish the page

custom-image-frontend

Video Tutorial

click here to know How to apply overlay on featured image