I frequently experience issues with input not being accepted on my iPad Air and Magic Keyboard.
I tried inputting text into Proton Sheets using an 11-inch iPad Air M2 and the official Magic Keyboard, but the following problems frequently occur:
Pressing the cursor keys does not move the cell.
When typing text with the cursor in a cell, the typed text is not entered into the cell (the typed text does not appear anywhere on the screen, and there is no response whatsoever).
The conditions under which these problems occur are unclear. Sometimes, tapping the screen several times will allow input to be accepted, but often this does not.
In any case, these are basic bugs, and it seems that Sheets has not been tested with a hardware keyboard. Until these are fixed, I cannot continue to use Sheets. I hope for an immediate improvement.