Can you elaborate a bit on what you mean by "not visible" - are you receiving any error message, or is the viz simply blank?
Have you been able to reproduce this issue in Chrome, Firefox, IE, or any others? How about other machines? Do other users experience this behavior?
Sorry for the late reply.
The viz is not at all visible to all users, all machines and in all the browsers. In other words, I do have 12 sheets in desktop file and I am able to see only 11 sheets in Tabeau Online, users of Tableau Online are not aware of the 12th file as there are no traces at all.
Thank you for the reply.
I have already selected the option to show the worksheets as tabs.
Could you possibly share the workbook so that we can test it ?
The alternative would be to open a case with our support team.
They can actually access your Tableau Online site if you allow them to by enabling it.