I created a WebTile for the Microsoft Band following the instructions here. The webtile installs and works on WP8 devices but not Android. On Android I get the message "The tile is invalid. Please check with the tile source to get the valid file, and then try again." Any ideas?
So it turns out it was a casing issue but not with the file "webtile" extension. I had the path to the icons folder as "Icons" and it was "icons/tileIcon.png" in the manifest. Apparently WP is okay with the path casing not being perfect and iOS and Android are not.