You can already do that: open the JavaScript file and show the web preview. Then tap on the address bar, enter the path of the HTML file and press Enter on the virtual keyboard.

From now on, Textastic will show the HTML file when you open the preview of the JavaScript file.

Also, which version of the app do you use?

Thanks for letting me know!

On which iPhone model does this happen? Did you see any pattern when this happens? Which buttons exactly (below the file list? below the editor? below the "Local Files"/"iCloud" selection?)

I use the app myself every day and haven't notice this so far, so any additional info helps.

Do you mean as a sort order of downloaded files? How do you plan to use this feature?

Wouldn't it be easier to download files from different hosts to separate folders?

I'll consider it. I thought the list wouldn't be useful without seeing the matches in the file.

Currently, the font choices in Textastic for iOS are hard-coded in the app. I'll consider custom fonts for a future update.

I've just sent you a TestFlight invitation for the current beta version of Textastic 6 which should fix this issue. You can install it in parallel to Textastic 5 and access your files.

Emmet support is already in the current beta version and will be added in Textastic 6.3.