Error: 49 while try to save the file in XD.

For all of you that are facing this issue, try the solutions in the following order:

• Ensure that you are on the latest version of the XD app
• Try solutions in https://helpx.adobe.com/xd/user-guide.html/xd/kb/fix-issues-with-xd-cloud-documents.ug.html#unable-to-save-cloud-docs 
• Use File > Save As to save the file locally to your computer
• Create a new user profile and try logging into XD from the new user profile
• Repair Creative Cloud Uninstall the Adobe Creative Cloud desktop application

Other solutions that have helped some users:

• Reduce file size by splitting a project into multiple smaller projects.
• Rename your cloud files after downloading a copy to your local computer: Will retain local changes but break links to other docs, try to relink the docs in this case. 
• Clear temp files. You will lose latest changes to your doc and the doc will revert to the last saved version.
  • Quit all adobe related processes
  • Click start type 'run' or an equivalent in your os language
  • Enter %temp%
  • Delete all files in the local/temp folder that shows up
  • Click start type 'run' or an equivalent in your os language
  • Enter 'temp'
  • Delete all files in the temp folder that shows up
  • Reboot + relaunch cc and xd

Note: If you still face issues, please reach out to Harshika Verma with logs so that we can escalate the issue to the team for further investigation.

We will try our best to help.

Thanks,

Preran