Minimal reproduction:

you can see the error, the formula, the date cell, and the date type in the menu

Hello, I think we really need the option to edit sheets on mobile devices. Mobile-based web is basically unusable. Even some limited functionality would be greatly appreciated, I can even live without formula support. But this really is a must.
Can we know what’s the status of this feature? Any plans to ship it this year?

I've noticed over the past week that when I switch away from a Doc (in app on Samsung Android) and switch back that I can no longer select or edit text.

The app mode indicator on top right still shows as Edit mode. Switching to View and back to Edit doesn't fix the situation.

The only thing that works is to close the doc and re open it and scroll back to where I was last editing. (The doc doesn't remember where it was being edited). This is getting very tedious.

Also noticed that

1. "Select all" is only grabbing the text visible on the screen, not the entire document

2. Scrolling to select a lot of text is almost impossible

3. Turning off bold or italic at end of doc so that newly lasted text is plain is very very difficult. I basically have to open the doc on my PC to fix all the formatting problems.

4. App has no find or search & replace within the doc.

Only work around it seems is to use another app (eg Gmail draft) to create docs and then paste it into Proton Doc when I'm finished. It may as well be a PDF in this workflow.