We have reviewed this at our end. You just need to save them on the cloud if you add or edit any drawings on the charts you will see the dotted cloud icon to save and wait for a few seconds to reflect the changes.
Kindly test the following.
1) I changed the normal candles to bars.
2) changed background color to black.
3) Removed horizontal / vertical grid by changing color to black.
4) removed current close horizontal line.
Saved as layout. saved a copy too.
The current layout doesn't store these changes. Next day these things revert to default even after "cloud save". The layout, timeframe , candle colors and symbols are saved.
I have to reload the copy i made and delete the working layout as i call it corrupted. Then my copy now becomes working, so i create new copy for next day.
This cycle continues so maybe not with drawings but "all" preferences are not getting saved.