Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Before continuing with this, I would like to confirm where the focus is in all of this since it would serve no purpose to keep moving from one to the other
a) - Using Word online or b) - The Word desktop app
For the rest of this response, m oy going to focus on the Word desktop app and have to say I am not a Mac user so can only provide info as applicable to the Windows environment. Any quetions specific to the Mac environment for the desktop apps need to be posed in the applicable catgory focused on Mac.
With that said......
#1 - <Save> vs <Save As>
If a document is opened from folder being sync's by OneDrive - the <Save> option would not be enabled.
#2 - As to what appears for OneDrive in Word, is the OneDrivee account connected as shown in the screenshot. If not, that needs to be resolved. Like I said, I can't speak to what Word looks like on a Mac but in Windows it should appear similar to what is shown
From within Word - go to "File" and then either "Account" or "Open"