Hi Ольга Попова,
Unfortunately, at this point the Jira Mobile app for both Android and IOS is presently unable to view/edit custom fields of type checkbox. This is nothing that you are doing wrong, I am afraid that this is just a current limitation of the mobile app.
There is a public feature request in order to add these kinds of fields in the mobile app, JRACLOUD-63910. However we do not have a clear time frame for if or when that feature might get added.
I would recommend watching that ticket for updates as to when this might become available.
I am afraid I do not fully understand your question here. However since it seems like your concern here is not directly related to this question on checkbox custom fields, it would be better served to create a new post here on community for your question.
Provided you tag this question with the jira and jira-mobile tags, this should help make sure that users monitoring those collections will have been vision into the questions being asked in those collections.
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