Hi NeithLeigh
The native Gallery app is meant for just standard image formats and does not support product specific formats, not even Adobe products. If you have InDesign or Photoshop files you wanted to import into Adobe Debut; the best way to do so is to upload your .psd and .indd files to the Adobe Creative Cloud Files website https://creative.adobe.com/ from your desktop and then import them into Adobe Debut on your tablet through the Creative Cloud option.
-Dave
