Slade 3 sprite importing

[ZyzzK]

I have a png of a posed hl2 character of which background I edited out using Gimp. I would like to receive some help as to how I can import it to slade and make it work as a corpse sprite(I'm using the OzCorpses wad to do this, but when I import the png its just blank)
Any tips?

Edited May 8, 2024 by ZyzzK

[chikokevo]

Ibmade vid on similar topic, perhaps this would help -