I'm playing Mobile and this is some tips that you (maybe) need to know:

1: Doedicurus(bruh I don't remember the name) will harvest metal,stone and obsidian when gather from obsidian rocks,and more than ankylo.

2: There is only simple-cheap(not really) way to carry lot of this resources is agentavis,and this bird is slow. BUT if you have a quetzal and quetzal platform saddle, it will be faster (whatever you use, just make sure that creature have platform saddle).

+Let argentavis in the platform,up grade a lot of level to speed at big carry creature.

+Put all obsidian to argentavis,(doesn't need to care the agent 's inventory,just make sure that the big creature that carry agent still can move),and set argentavis at passive.

-This will make the big creature get only 50% weight of the obsidian, help you carry more than only use bird or big creatures

/I don't need this tip get up,but hope you all can get more good times/