If for Google Docs, Sheets, Slides or Forms cannot load your file and you see error message Unable to load file then see this fix.

Fix This video file cannot be played Error Code 102630 when playing an Internet-based video in your default browser in Windows 11/10.

So, I do a lot of little side things with XSLT generating HTML from XML. Always worked fine in Chrome. Now, all I get is a blank screen, and, in Inspect Element, this: Code: Unsafe attempt to load ...