Can I Make My Own Logo Designed as a Flag Symbol?

[vayvayva]

Hello. I designed a logo for myself and I want to use it as my flag symbol. In which formats should I put my logo in which folders in the game to select and use the flag editor without any problems?

 

[ABAlphaBeta]

.sddl in the data/kumbilai folder

 

[vayvayva]

.sddl in the data/kumbilai folder

i couldn't find the kumbilai folder?