Umlauts (Ö, Ü, Ä) on English US-International keyboards on Android with a physcial keyboard
Alt codes don't seem to do anything. AltGr + O, U, A create ó, ú, á.
I need a way to type ö, ü and ä without switching layouts. I'm using a Galaxy Tab S7 on Android 11, if it matters.
The "international" version for US keyboards is
But whether this actually works might depend on how your physical keyboard is configured, as well as on your Android configuration.
Here's an image (source: https://en.wikipedia.org/wiki/British_and_American_keyboards ) of the international layout: