Your comments

I am amazed to see that after all this time there is still no synchronization option. Sync doesn't even have to be automatic. I am happy to trigger it myself. I just can't imagine using a workflow that requires me to only make changes on one device or to remember which files have been changed where. 

Yes, sync is nontrivial, but it is not black magic ether. The problem has been solved for decades. 

Textastic is a great editor but it sits on my iPad unused and unloved because it cannot perform such a basic function. Without either sync or version control support the app is useless and my money has been wasted. Either one would be sufficient. I am about to go buy Diet Coda but I'll come running back to Textastic the moment I can actually make use of it.