Tile map question

I am still new to unity but after playing around with unity I have decided I want to make a stradegy game and I have it detailed out in my head. The first thing i need is tiles. I have the tilemap created and the tile palette window open and for now I just need a single hexagon sprite to be able to place down. First in the assets folder i hit create, went to sprites, then clicked hexagon but when i create the new palette it won’t let me chose it. What do i do instead?

Also as a side question will i be able to add materials to individual tiles in the tilesmap after they are placed down?

Sorry if its a bit hard too understand I can try to clarify it if is

Have you dragged the wanted sprites into the palette window?

Yes. I created it by just right clicking then going to create, sprites, and hexagon. It won’t let me chose it though

Watch this

Okay this helped me. I was trying to sleect the sprite before chosing the folder it would go in