Use the menu item Edit -> Find in Files… or Shift-Command-F.

Try a three finger swipe left/right: that's the iOS 13 standard gesture for undo/redo.

I'm working on it. See https://twitter.com/Textastic/status/1240620765420163074

Secure ShellFish might be an option then. It's a file provider for the Files app that connects to SFTP servers. You can open the folder as an external folder in Textastic and changes to files are uploaded automatically. 

Good point. That definitely needs to be improved - also on the iPad Pro without home button.

Hmm, if you save your Markdown files somewhere in the "iCloud" location in Textastic, files are synced automatically across your devices. Am I missing something? 

See https://www.textasticapp.com/v10/manual/managing_files/local_files_icloud.html#icloud for details.

This will be fixed in Textastic 9.0.1.

Thanks for letting me know. I'll look into it. 

While the other settings can be configured per text field/text view, the "." shortcut is a global setting unfortunately. AFAIK there is no way to disable it only in one app since this is handled by the iOS text system.

I will not be able to provide this for all supported languages. What would be the main use case for you? Would supporting HTML, CSS, and JavaScript be a good start ?