What format does my evidence need to be in?

I’m a 3d artist and I am using a program called Blender. Do I just need to take screenshots when sending evidence of my files to the tech nation? Or do I need to send custom outputs from blender? like FBX, Stl, x3d.

Psd printouts of my work from Adobe Photoshop? Or is a screenshot enough?

I want to ask this too, can i put mp4 files in my evidence?

Can I write text on the screenshots to explain what it is?

Maybe upload it on personal drive and give link URL for evidence to view?