Adding SendSafely widget

Good morning!

I’m loving this plugin, thank you.

I do have one challenge currently. I would like to add the facility to upload large files to my tickets in Zendesk. SendSafely seems to be a good solution, and they have helpfully sent me new html/javascript for that page (not updated yet, I need to check the following). My concern is that changing the html to include the widget will impact on my ability to make updates and changes to the form in future, and I anticipate that there might be the occasional update.

I am not a confident coder, so would it be possible for someone to assist me with checking that the widget won’t impact the plugin’s functionality?

Thanks

The page I need help with: [log in to see the link]