I resolved the original question, but have an updated issue:
If i have 20 objects that are the same, and using the same tilesheet - why does it have to create 80 tilesheets? That just adds to the size of the project, when it can simply use the same 4 tilesheets that are generated.
.capx - updated capx for reference. There are 4 trees present, they all use the same tilesheet. Upon export, they generate 16 tilesheets - even though 4 would be enough. Is there a way of using only those 4?