Is the image you worked on a RAW image or a JPEG?... the one in the
quick collection. If it is a JPEG and you did NOT re-export the image,
the original image will NOT have changed. (In Lightroom all corrections
are just a series of instructions that are not applied to the image
until exported)
If you you had a RAW image and you exported it as a JPEG and it did not show up... I am not sure why.
Did you shoot RAW + JPEG?
Need more info