Your inPixio software reports "File not found" when trying to save a project in a Cloud-based folder.
Examples - OneDrive, Dropbox, Google Drive, iCloud, Mediafire, BOX, etc.:
Please make sure you grant all of your inPixio Photo apps access to this specific folder via the Windows Defender Security Centre. You need to select the "Allow an app through Controlled folder access" option. That action will whitelist all of your apps. You will be able to edit, create or remove files from this protected folder: