Samsung S6-Lite tablet running Android 10.
I don’t know if this a Krita thing or Android thing, but krita is being launched for all document types, whether it knows what to do with them or not. For example I just downloaded a Word document from email. When I clicked on the notification of successful download, Krita tried to open it, and of course failed. If I use the Samsung MyFiles app and navigate to downloads folder it’s the some thing.
I looked at Krita under “Android Settings > App info > Set as default”: none are set.