You can add custom syntax definitions to Textastic by using TextMate bundles. See http://www.textasticapp.com/v6/manual/lessons/How_can_I_add_my_own_syntax_definitions__themes_and_templates.html

I did a quick google search for "SystemVerilog tmbundle", but it looks like currently such a TextMate bundle does not exist, sorry.

Hello, it looks like you did not select a local target folder on the left side of the remote file transfer screen, so the app does not know where to download the files or folders.

On iPhone, tap on "Local" and navigate to a folder in "Local Files" or "iCloud". Then switch back to "Remote" and downloading files and folders from Google Drive should now work.

Hello, the "Open…" command invokes the iOS document picker. When you select OneDrive from the list of file providers, the UI you see is actually provided by Microsoft's OneDrive app, not by Textastic. It seems like the OneDrive file provider extension doesn't know how to handle .php files.

So I'm sorry, but this problem can only be fixed by the OneDrive app.

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This was possible with Textastic 5.3.1 and earlier, but since I released Textastic 6 as a new app, it doesn't allow you to download versions earlier than Textastic 6.0, so it only works with iOS 9 and later.

I'm pretty sure this didn't happen in earlier macOS versions, but I can see this problem here, too.

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.