One activity not syncing to GC today

I have 5 activities from today, all but one Synced. Watch has and had plenty of battery. GC on my phone and PC is up to date. Watch is up to date. I have powered all on/off multiple times. I followed the instructions to manually browse and choose the file and upload and got the error message that the file type is not supported. This is the first time I have experienced this.

is there a way to get my activity up to GC?????