Cant connecting task link on android/mobile device

Dear dhtmlx team,
I using dhtmlx Gantt with pro license.
Now 'im trying to connect task, but nothing happened.
I’ve made gantt_link_point to be bigger, but still can not drag it to another task.
Event, in the example, i cant do it.
Can you explain what have to do ?

Hello,
this is a current limitation of touch input support. Drag and drop of links, as well as vertical drag and drop of columns in grid area are not supported in the latest version of gantt.
Right now the only solution that does not require modifying the source code of the component would be defining some alternative UI for creating relations. For example some kind of predecessor selector in lightbox, or somewhere in your UI