Welcome to Logseq and the community @John_Caron!
Sorry to read you lost work. Have you already checked in the folder where you stored your graph? There’s a folder inside it called logseq, and within that folder you should see a folder called bak with your lost notes.
As your experience shows, we strongly recommend against services like OneDrive, iCloud and Dropbox. The way Logseq writes files to the hard disk and how those services pick up changes makes it a recipe for disaster. It’s the reason we built our own Logseq Sync service, but it doesn’t work yet in the browser version. You can open those files with any plain text editor.
The solution for now? Store your Logseq graph in a non-synced folder (aka local). You can always manually make a copy of the graph folder and put it in a network folder for easier transfer. Just make sure to not open a Logseq graph that’s located on the network drive.