Export ATEM files from Photoshop

"Media Players

ATEM Television Studio features two media players that are used to playback files stored in the media pool. The media pool stores your files on flash storage so they are saved in the switcher, even when the power is turned off! You can use PNG, TGA, BMP, GIF, JPEG and TIFF files. Files with alpha channels can be used as bugs, lower thirds, titles and more!"

https://www.blackmagicdesign.com/uk/products/atemtelevisionstudio/software

What difficulty do you face?

They support all major industry formats right out of the box, so I'm not sure what specifically you need to know. Anything from TIFF to JPEG to TGA or DPX will work, even PSDs if they don't use fancy stuff only PS can handle.

Mylenium