Equirectangular not an available option for world HDR image

I was trying to figure out why my HDRs were blurred to the extent they were single color–they’re 2K and 4K images, not stretched. On ONE file they have worked as intended, and after A/Bing I noticed that on all the others “equirectangular” projection is not an option–not even in the dropdown, just flat, box, sphere, and cube. Why is this, and how can I get that option back so my HDRs work? (And how can it be that it only works in one file?) I’m rendering using Cycles in Blender 4.0.

Thanks!

Just a wild guess, you’re using the wrong node

For environments you should use the “Environment Texture” instead of “Image Texture”.

That would be it–thank you so much!

It pays to know smart people.