[ISSUE] Can't use sprites sheet with TTRI (only Tiles or Map..)

[Feralbi]

I want to use the sprites part of the sprite editor (256) with TTRI but if I go 256 for example (the beginning of the Sprites tab) it rounds up to 0 and goes back to the beginning of Tiles (0).
I have my map graphics in Tiles (because TIC doesn't allow graphics from the Sprites tab on the map..) and my sprites in the Sprites tab.
Is there a workaround or I'm missing something...?
Many thanks.
Self solved... as a reminder: The sprites part starts at 128...