Not able to save Binded files in Adobe Acrobat Pro

Hope you all are doing well.

I am using windows 11

Running Adobe Acrobat Pro (64-bit) 

File Version: 22.00320322.0Total Virtual Memory: 137438953344 KB
User Name: XXXXXXX
Windows Detail:
Tablet PC: Yes
Starter Edition: No
Media Center Edition: No
Slow Machine: No
Windows Directory: C:\Windows

I often have 1500+ pages of individual scanned pdf's that I need to combine.

I am running into the problem of not being able to save the document once combined.

I have Opened Acrobat. Go to Edit>Preferences>Documents - uncheck Save As optimizes for Fast Web View. Save the combined file

 With no ability to save.

I have navigated to Edit>Preferences>General

deselect these two options:

• Show online storage when opening files.
• Show online storage when saving files.

With no ability to save.

I have repaired the system, I have uninstalled and re-configured. 

Yet still unable to save the document to the c drive, or the desktop, or anywhere.

Any help with this would be wonderful.

Thank you!