Photoshop pdf format created in CS5 won't open in CC 2018

[mojo_baer]

I saved many files in the photoshop pdf format using Photoshop CS5, they were saved with full capabilities for layer editing.  I was able to open the with no problem and they had all the layers in CS5.

Now that I'm using Photoshop CC 2018, when I try and open those files I get a dialog box that is trying to import the pdf as a simple pdf - with no layer information.  It is a flat 1 layer image.

Anyone else have this problem?  Is there an option somewhere in CC 2018 to specify reading the photoshop pdf format?

Thanks!

[gener7 · Accepted solution]

Perhaps save as Tiff in CS5 to keep the layers, then open in Photoshop CC 2018.