1
Inspect the saved file
Open the downloaded image rather than relying on the editor preview. Look across the subject, the empty background and the corners for a logo, repeating pattern or faint text. A preview can show the cutout without showing every condition of its export.
2
Test the background
Place the saved image over both a light and a dark color. This can reveal a solid background mistaken for transparency, pale remnants around the subject or marks that blend into the usual checkerboard preview. Zoom in on hair, glass and other difficult edges.
3
Check it at the intended size
View the result at the size you plan to use. A small erase bg export may appear sharp in a thumbnail but look soft in a presentation or product layout. Note the saved dimensions and confirm that any export conditions work for your project.