my version of Dreamweaver is not compatible with my version of iOS.

yes, as @Ben107584 M told you, just go ahead with an FTP client, and a code editor.

so

Code editor - https://code.visualstudio.com/Download

SFTP extension for VSC - https://marketplace.visualstudio.com/items?itemName=liximomo.sftp

You might want to migrate your current site over to an online shopping cart with CMS.  WordPress, Webflow, Wix all support e-commerce sites. No code editor required.

Dreamweaver has never been compatible with iOS (mobile devices).  You need a Windows or Mac desktop OS.

CS6 won't run on Catalina, Big Sur or Monterey.  It's too old.  You need a modern code editor that's compatible with your device.  Apple store has apps for iOS. 

CODE EDITORS:
-- Adobe Dreamweaver CC - https://www.adobe.com/products/dreamweaver.html
-- Codespaces (free, browser-based) - https://github.com/features/codespaces
-- Nova (Mac only, formerly called Coda) - https://nova.app/
-- Pinegrow - https://pinegrow.com/
-- Sublime Text - http://www.sublimetext.com/
-- Visual Studio Code (free) - https://code.visualstudio.com/

Hope that helps.

CS6 is 10 years old.  You could just download a text editor and update the HTML if it is a simple site.