toBlob is a feature that didn't have support in Safari and Microsoft Edge until more recently. Are you using Safari or Microsoft Edge and if so, are you able to update to the latest version? If not you could try Firefox or Chrome.
We may have to look at a better way to handle users who don't have toBlob support, since some people are on locked systems and can't update.
AComputerChip
@TomFulp Any solutions?