This should work since Textastic 6.4.

Yes, you are right, the syntax definitions need an update.

No, sorry, I'm not aware of such an issue. Do you have any more information on when this happens? Which version of the app and iOS, which device?

You cannot make it appear with a single tap on the editor?

Hello, what happens when you try to preview the HTML file in Safari (button in the top right corner -> Preview in Safari)?

Hello,

you are right - at the moment, many files cannot be opened because the file extension is not known to the system. I plan to allow the user to open any file using the "Open…" command in a future update.

• in Textastic, tap "Open…" 
• navigate to Working Copy 
• press "Select" in the top toolbar 
• select a folder  
• tap "Open" 

Or do you mean a hardware keyboard? I just tried to select text with my Apple Magic Keyboard connected over bluetooth: no problems.

What happens if you copy the same text into Apple's Notes app and try to select text there? Do you see similar issues?

I don't know where to find a "Select All" command on the keyboard. Do you mean with a two finger gesture?

I've set the same font and theme and see no difference, sorry. I'm using the "Plain Text" syntax definition.

I opened the file you sent me on my iPad 10.5 running iOS 11, did two single taps on the editor and chose "Select All". I do not see any delay at all. I also tried copying and pasting and see no delay.

Maybe it is related to other settings in the app. Which syntax definition and theme do you have selected? Which keyboard are you using? Which font and size?