Open photo files on iPad photoshop app, what file types are supported?

[#1]

I am trying to open RAW photo files on the iPad photoshop app. However an error message displays advising of unsupported file format. 
The raw files I have tried are lumix RW2 and Pentax DNG. 

What file types are supported?

[#2 · Accepted solution]

no raw files on the ipad: The supported file formats for placing a photo in Photoshop are - PSD, PSB, TIFF, JPG, and PNG.

https://helpx.adobe.com/photoshop/using/place-photos-ipad.html