PNG in Illustrator doesn't have transparent background

Question

Does anyone know why png picture doesn't have transparent background? I have tried to switch from GPU to CPU preview, it doesn't work. I have open transparent grid but still the behind image is blocked.

WAN MAN30231734ecl2 · Accepted Answer

Preview mode is normal, I haven't turn on knockout group, but I find out if I turn on the opacity & mask define knockout shape,  the problem solved.

Monika Gause · Answer

Are you perhaps in Overprint preview mode?Could it be that you have Knockout group turned on for the image or the layer? That is a setting in the advanced options of the Transparency panel.

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