You can upload any type of file using the file transfer screen:
https://www.textasticapp.com/v10/manual/remote_servers/remote_file_transfer_screen.html

Hello, Textastic only supports ".tmTheme" files. ".sublime-color-scheme" files are a completely different file format that is not currently supported.

I'll consider adding support for .sublime-color-scheme" files in a future update.

You can find an online editor for .tmTheme files at https://tmtheme-editor.glitch.me/ 

It has a huge gallery of themes you can download and also includes a "Gruvbox" theme (but not Gruvbox Dark Hard).

Thanks a lot for the details. I’ll look into it. 

Which syntax definition or type of file are you using?

You can find a character count and word count in the file properties. See https://www.textasticapp.com/v10/manual/viewing_editing_files/file_properties.html

But, this is for the whole document, not for the selected text.

Thanks, I'll take a look!

Sounds useful. Which editors do you know that have this feature? 

On macOS, you can actually change the behavior in system settings:

Go to System Settings -> Desktop & Dock and enable "Ask to keep changes when closing documents".

When you now close a file that you changed accidentally, you will be asked if you want to save your changes or revert the changes "to undo the changes since you last saved the document".

This is now fixed in Textastic 10.3.1 which was just released.