Why does PNG not display as transparent?

[LondonPhotographer]

When I move a png file on top of a jpg file it still seems to display its checkerboard background. I have double-checked that it is a proper png file by re-exporting with transparency checked. But still no dice. Not sure what I’m doing wrong. Example below. Thanks.

[c.pfaffenbichler]

Please post a meaningful screenshot including the pertinent Panels (Layers for example) of the file you used to create the png. 

[c.pfaffenbichler]

The thunbnail in the export dialog seems to feature two different sizes of checkered background patterns so I suspect there is a Layer with the Pattern within the file. 

[LondonPhotographer]

Ah ok, thanks.

[PECourtejoie]

Yes, Can you open the PNG, and see if it is not a checkerboard pattern, instead of 'real' transparency?