Epson Print Layout program and Alpha channels

I recently downloaded the Epson Print Layout program and found that I could not load .tiff or .psd files into the program. I can load .jpegs, but I prefer not using this type. I contacted Epson and I was told "We tested it with one of our senior technicians and confirmed that the file was imported into Photoshop and turned off the Alpha Channels. Attached is the file that was saved on our end that works within Epson Print Layout."
I was able to load the .tiff file they sent back to me. They went on to say that I should contact Photoshop for help and they couldn't help any futher.

Has anyone else run into this before? I'm not sure where to turn on the Alpha Channels except when I save a copy in Photoshop where you can choose to check the Alpha Channels. I did that but it didn't solve the problem. I'm guessing that somewhere between Bridge and ACR it is turning off the Alpha channels? I'm a bit mystified. Incidently, I am able to load jpegs, but not .tiff or .psd.

Any help would be appreciated. Thanks.