Collabora (CODE) - Editor on iPad/iPhone not working

Hi,

after the desaster with OnlyOffice “stealing” the edit function on mobile devices, I’ve installed the Collabora app and spun up a VM with Collabora Online Development Edition on my server.

Editing on a PC in the browser works fine, but when opening a document on the iPad, all edit buttons are grayed out. Did I miss some settings to enable the editing on my iPad / iPhone in Collabora somewhere?

OK, stupid thing … rendering issue with Safari, the bottom line is not visible and and the blue “Edit button” just to 5%. So I did not see I need to activate the edit.