Formatting graphics for ATEM Software

STATS:
OSX 10.14 / MOJAVE
ATEM Version= 8.10
Camera input feeds = 1080p
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Objective: Looking to prep graphic stills to throw into the Media Pool (MP1 & MP2)
Question: What resolution (ie. 1920x1080px @ 72dpi) and format (jpg, png, etc) do I need to prepare them as?
Bonus Question: Is the Media Pool only for stills or can it import Mp4 clips?
Please help if you can and

THANK YOU

in advance.

Recently, I noticed that when I try to add a graphic still, it is cropped no matter what resolution it's in (1920x1080 - 320x240 ie).
Is it a settings thing within the ATEM software and if so, where do I adjust it?
THX

What ATEM model?

Am using the mini pro extreme

Use 1920 x 1080. PNG or JPEG.