Thanks for your report. I've passed your save along, but I'm afraid that this save may already be corrupted.

If you get an error with the diagnostics file, it is probably too large, seeing how just loading the save and trying for 10 seconds generated an 11mb diagnostics file for me. If you zip it, you should be able to upload it.

Hmm, I tried zipping the diagnostics file and it reduced to 257KB, but I still get the same error when I try to upload it.

That is odd. Could you tell us what browser you are using, and the steps you are taking to upload?

Delete spaces and special characthers from file name

Diagnostics - 2019'03'03 @1523'15''.html

...and now the file uploads just fine. I was clicking the "upload file" button on the toolbar across the top of this text box then selecting the file, no idea why it worked this time but not previously.