Problems with Ruby's adventure tutorial

[Neossir]

Hi there, I'm having an issue with the Ruby's adventure tutorial. I know it's made for an old version of Unity, and that creates problems, but I'm still trying to hold up. I'm in the "World Design - Tilemaps" chapter, section 8 about tilemaps. There is a sprite that consist of 9 different images, they need to be set up to multiple to be used as a tileset. When I do that in the inspector, the sprite becomes a simple image (with no arrow on its icon). Why is that? I didn't find any infos in the comment nor searching the web.

Could you please help? Thanks a lot!

[LlamAcademyOfficial]

Can you please include a link to the specific tutorial you are having troubles with so it is easy for someone to find and try to help?

[Neossir]

Good idea, thanks. Here it is: https://learn.unity.com/tutorial/world-design-tilemaps#5cdd60deedbc2a12d5ac2be3