I agree. It is difficult to add this feature for mobile but it could work. Let‘s imagine a small button next to the chess board which turns a drawing mode on and off:
- In the drawing mode, you can’t move pieces - You can only draw arrows.
- In the normal mode, you can’t draw arrows - You can only move pieces.
The buttton changes it’s inner color when switching between drawing mode and normal mode.
I would like if there was a features to use arrows in mobile