He was talking about textures for rockets bob.
Roro35 you can't import textures for rocket under Android. It's possible for SFS 1.35 on PC, but not for the mobile version.
However you can use built-in textures ingame:
View attachment 57647
Just select a part, and check those 2 buttons in the lower right corner.
Note that you will need the skins expansion for this. Do you have it?