Mapping shape/ size and colour limitations

[Georgedude]

Sorry to open another issue, I can't find any documentation on this

I've played around with importing sprites and can see it needs to fit within the mapping boxes, but getting a specific size or shape without causing everything to bug out is proving difficult. Granted I'm using a fan made sonic 3 inspired sprite sheet, is there a way to import a larger sprite without causing it and other sprites to freak out?

Another issue is certain colours not working such as green which is replaced with grey. Can I fix this?

[Georgedude]

I thought I'd made a breakthrough in understanding the tile system but now I'm more confused than ever: I added new tiles like so and mapped them out then imported a sprite, all looks good in Flex

Then in game, it appears like this

One step forward two steps back... what am I likely doing wrong here? Might be worth noting that I have to save it with DPLCs unticked otherwise it throws an error when compiling the rom:

s2.asm(77477):7: error #1010: symbol undefined
MapRUnc_Sonic.frame45
dc.l MapRUnc_Sonic.frame45
~~~~~~~~~~~~~~~~~~~~~
s2.asm(77478):7: error #1010: symbol undefined
MapRUnc_Sonic.frame46
dc.l MapRUnc_Sonic.frame46
~~~~~~~~~~~~~~~~~~~~~
s2.asm(77479):7: error #1010: symbol undefined
MapRUnc_Sonic.frame47
dc.l MapRUnc_Sonic.frame47
~~~~~~~~~~~~~~~~~~~~~
s2.asm(77480):7: error #1010: symbol undefined
MapRUnc_Sonic.frame48
dc.l MapRUnc_Sonic.frame48
~~~~~~~~~~~~~~~~~~~~~