ForeRunner 965 Not Syncing Triathlon Data in Garmin Connect - File Upload Didn't Work Either

On Sunday 12/15/2024, I completed an Ironman 70.3 triathlon. I can see all of my stats on my ForeRunner 965 watch, but I cannot get the triathlon data to show up in my Garmin Connect app, even after numerous tries syncing. 

I read on another Garmin Forum that I could connect my watch to my Windows PC and upload the .fit file through the Garmin Connect Web portal, but each time I try that, it comes back with an error message saying "An error occurred with your upload. Please try again." 

Here is the file in question -