why has save button been disabled

The Save button becomes enabled after the file is edited. If you just want to save it under a new location use Save As, or simply copy it from the current location to the new one.

assuming acrobat...

in the future, to find the best place to post your message, use the list here, https://community.adobe.com/

p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post (like this one has already been moved) if it helps you get responses.

<"moved from using the community then from cc services">

When you post a question you always need to tell the Adobe program you are using
There are MANY programs in a full subscription, plus other non-subscription programs
Please post the exact name of the Adobe program you use so a Moderator may move this message to that forum