I had to scrabble about a bit to find out how to open Working Copy repositories from iA Writer (on iOS), so I thought I’d document it here.
Basically you need to add it to your Locations.
Step 1: Edit Library
Bring up the Library view in the left hand pane of iA Writer and hit the Edit button.
Step 2: Add Location
Tap the Add Location… link.
Step 3: Select Repo
Then, in the panel that comes up, you should see a Working Copy entry. Expand that and select the repository or directory you want to add. Then hit the Done button at the top-right of that panel.
If you do not see Working Copy as an option then go into your iOS Files app, click on the icon with the three dots at the top of the right-hand pane, select Edit and move the slider to the right next to Working Copy. Then go back to iA Writer and repeat the steps detailed here.
Step 4: Finish Up
The Working Copy directory will then be added to your Library under Locations.
You can now add and edit files in that repository as you choose and then, when you’re finished, just go into Working Copy and commit and push the changes.