Has anyone run into issues uploading logs to Control Hub? I've run into this in my environment and can't find a root cause. When I submit logs via Webex (Profile pic-->Help-->Send logs) I get an entry in Control Hub Troubleshooting showing the log submission attempt but only the metadata is available. The "User logs" icon is grayed out and shows "Can't find user logs to download."

I can see on my system that the logs are all gathered together into a folder at C:\Users\<username>\AppData\Local\CiscoSpark\<filename_guid_from_metadata>\
BUT... the metadata leads me to believe this folder is supposed to then get compressed into <filename_guid_from_metadata>_FB.zip and uploaded but this zip file never gets created and therefore when Webex goes to upload this zip, it doesn't exist, and the logs never get properly submitted to Control Hub. In addition if I export diagnostic data via Health Checker-->Diagnostics I only get one HTML file in the folder and nothing else whereas when it works properly I get a bunch of zip files and other diagnostic information.
So what process/call is getting blocked to prevent the creation of this? I thought it might be related to UAC settings, antivirus, or something else that's getting in the way but I can't confirm or deny any of those things conclusively. Sometimes it works out of the blue, then I need to restart my computer and it stops working again. I've tried disabling my AV, running in Safe Mode with Networking, adjusting the UAC level, watching all of the file/registry activity with Procmon, etc. Does anyone have any suggestions on next steps/troubleshooting?